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2021-03-17firewire: ohci: Use tasklet_disable_in_atomic() where requiredSebastian Andrzej Siewior1-2/+2
tasklet_disable() is invoked in several places. Some of them are in atomic context which prevents a conversion of tasklet_disable() to a sleepable function. The atomic callchains are: ar_context_tasklet() ohci_cancel_packet() tasklet_disable() ... ohci_flush_iso_completions() tasklet_disable() The invocation of tasklet_disable() from at_context_flush() is always in preemptible context. Use tasklet_disable_in_atomic() for the two invocations in ohci_cancel_packet() and ohci_flush_iso_completions(). Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20210309084242.616379058@linutronix.de
2020-09-25firewire-ohci: use dma_alloc_pagesChristoph Hellwig1-15/+11
Use dma_alloc_pages to allocate DMAable pages instead of hoping that the architecture either has GFP_DMA32 or not more than 4G of memory. Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-08-23treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva1-2/+2
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-07-16treewide: Remove uninitialized_var() usageKees Cook1-7/+7
Using uninitialized_var() is dangerous as it papers over real bugs[1] (or can in the future), and suppresses unrelated compiler warnings (e.g. "unused variable"). If the compiler thinks it is uninitialized, either simply initialize the variable or make compiler changes. In preparation for removing[2] the[3] macro[4], remove all remaining needless uses with the following script: git grep '\buninitialized_var\b' | cut -d: -f1 | sort -u | \ xargs perl -pi -e \ 's/\buninitialized_var\(([^\)]+)\)/\1/g; s:\s*/\* (GCC be quiet|to make compiler happy) \*/$::g;' drivers/video/fbdev/riva/riva_hw.c was manually tweaked to avoid pathological white-space. No outstanding warnings were found building allmodconfig with GCC 9.3.0 for x86_64, i386, arm64, arm, powerpc, powerpc64le, s390x, mips, sparc64, alpha, and m68k. [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/ [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ Reviewed-by: Leon Romanovsky <leonro@mellanox.com> # drivers/infiniband and mlx4/mlx5 Acked-by: Jason Gunthorpe <jgg@mellanox.com> # IB Acked-by: Kalle Valo <kvalo@codeaurora.org> # wireless drivers Reviewed-by: Chao Yu <yuchao0@huawei.com> # erofs Signed-off-by: Kees Cook <keescook@chromium.org>
2020-06-15firewire: ohci: Replace zero-length array with flexible-arrayGustavo A. R. Silva1-1/+1
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://github.com/KSPP/linux/issues/21 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2019-11-13firewire: ohci: stop using get_seconds() for BUS_TIMEArnd Bergmann1-1/+1
The ohci driver uses the get_seconds() function to implement the 32-bit CSR_BUS_TIME register. This was added in 2010 commit a48777e03ad5 ("firewire: add CSR BUS_TIME support"). As get_seconds() returns a 32-bit value (on 32-bit architectures), it seems like a good fit for that register, but it is also deprecated because of the y2038/y2106 overflow problem, and should be replaced throughout the kernel with either ktime_get_real_seconds() or ktime_get_seconds(). I'm using the latter here, which uses monotonic time. This has the advantage of behaving better during concurrent settimeofday() updates or leap second adjustments and won't overflow a 32-bit integer, but the downside of using CLOCK_MONOTONIC instead of CLOCK_REALTIME is that the observed values are not related to external clocks. If we instead need UTC but can live with clock jumps or overflows, then we should use ktime_get_real_seconds() instead, retaining the existing behavior. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/lkml/20180711124923.1205200-1-arnd@arndb.de/ Reviewed-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156Thomas Gleixner1-14/+1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-08drivers: Remove explicit invocations of mmiowb()Will Deacon1-1/+0
mmiowb() is now implied by spin_unlock() on architectures that require it, so there is no reason to call it from driver code. This patch was generated using coccinelle: @mmiowb@ @@ - mmiowb(); and invoked as: $ for d in drivers include/linux/qed sound; do \ spatch --include-headers --sp-file mmiowb.cocci --dir $d --in-place; done NOTE: mmiowb() has only ever guaranteed ordering in conjunction with spin_unlock(). However, pairing each mmiowb() removal in this patch with the corresponding call to spin_unlock() is not at all trivial, so there is a small chance that this change may regress any drivers incorrectly relying on mmiowb() to order MMIO writes between CPUs using lock-free synchronisation. If you've ended up bisecting to this commit, you can reintroduce the mmiowb() calls using wmb() instead, which should restore the old behaviour on all architectures other than some esoteric ia64 systems. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2018-02-02Merge tag 'firewire-updates' of ↵Linus Torvalds1-1/+7
git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 Pull firewire updates from Stefan Richter - make JMicron JMB38x controllers work with IOMMU-equipped systems - IP-over-1394: allow user-configured MTU of up to 4096 bytes * tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: firewire-ohci: work around oversized DMA reads on JMicron controllers firewire: net: max MTU off by one
2018-01-13firewire-ohci: work around oversized DMA reads on JMicron controllersHector Martin1-1/+7
At least some JMicron controllers issue buggy oversized DMA reads when fetching context descriptors, always fetching 0x20 bytes at once for descriptors which are only 0x10 bytes long. This is often harmless, but can cause page faults on modern systems with IOMMUs: DMAR: [DMA Read] Request device [05:00.0] fault addr fff56000 [fault reason 06] PTE Read access is not set firewire_ohci 0000:05:00.0: DMA context IT0 has stopped, error code: evt_descriptor_read This works around the problem by always leaving 0x10 padding bytes at the end of descriptor buffer pages, which should be harmless to do unconditionally for controllers in case others have the same behavior. Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2017-10-25locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns ↵Mark Rutland1-6/+4
to READ_ONCE()/WRITE_ONCE() Please do not apply this to mainline directly, instead please re-run the coccinelle script shown below and apply its output. For several reasons, it is desirable to use {READ,WRITE}_ONCE() in preference to ACCESS_ONCE(), and new code is expected to use one of the former. So far, there's been no reason to change most existing uses of ACCESS_ONCE(), as these aren't harmful, and changing them results in churn. However, for some features, the read/write distinction is critical to correct operation. To distinguish these cases, separate read/write accessors must be used. This patch migrates (most) remaining ACCESS_ONCE() instances to {READ,WRITE}_ONCE(), using the following coccinelle script: ---- // Convert trivial ACCESS_ONCE() uses to equivalent READ_ONCE() and // WRITE_ONCE() // $ make coccicheck COCCI=/home/mark/once.cocci SPFLAGS="--include-headers" MODE=patch virtual patch @ depends on patch @ expression E1, E2; @@ - ACCESS_ONCE(E1) = E2 + WRITE_ONCE(E1, E2) @ depends on patch @ expression E; @@ - ACCESS_ONCE(E) + READ_ONCE(E) ---- Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: davem@davemloft.net Cc: linux-arch@vger.kernel.org Cc: mpe@ellerman.id.au Cc: shuah@kernel.org Cc: snitzer@redhat.com Cc: thor.thayer@linux.intel.com Cc: tj@kernel.org Cc: viro@zeniv.linux.org.uk Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/1508792849-3115-19-git-send-email-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-11-05firewire: ohci: propagate return code from soft_reset to probe and resumeStefan Richter1-2/+3
software_reset() may fail - due to unresponsive chip with -EBUSY (-16), or - due to ejected or unseated card with -ENODEV (-19). Let the PCI probe and resume routines log the actual error code instead of hardwired -EBUSY. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2015-11-05firewire: ohci: fix JMicron JMB38x IT context discoveryStefan Richter1-0/+5
Reported by Clifford and Craig for JMicron OHCI-1394 + SDHCI combo controllers: Often or even most of the time, the controller is initialized with the message "added OHCI v1.10 device as card 0, 4 IR + 0 IT contexts, quirks 0x10". With 0 isochronous transmit DMA contexts (IT contexts), applications like audio output are impossible. However, OHCI-1394 demands that at least 4 IT contexts are implemented by the link layer controller, and indeed JMicron JMB38x do implement four of them. Only their IsoXmitIntMask register is unreliable at early access. With my own JMB381 single function controller I found: - I can reproduce the problem with a lower probability than Craig's. - If I put a loop around the section which clears and reads IsoXmitIntMask, then either the first or the second attempt will return the correct initial mask of 0x0000000f. I never encountered a case of needing more than a second attempt. - Consequently, if I put a dummy reg_read(...IsoXmitIntMaskSet) before the first write, the subsequent read will return the correct result. - If I merely ignore a wrong read result and force the known real result, later isochronous transmit DMA usage works just fine. So let's just fix this chip bug up by the latter method. Tested with JMB381 on kernel 3.13 and 4.3. Since OHCI-1394 generally requires 4 IT contexts at a minium, this workaround is simply applied whenever the initial read of IsoXmitIntMask returns 0, regardless whether it's a JMicron chip or not. I never heard of this issue together with any other chip though. I am not 100% sure that this fix works on the OHCI-1394 part of JMB380 and JMB388 combo controllers exactly the same as on the JMB381 single- function controller, but so far I haven't had a chance to let an owner of a combo chip run a patched kernel. Strangely enough, IsoRecvIntMask is always reported correctly, even though it is probed right before IsoXmitIntMask. Reported-by: Clifford Dunn Reported-by: Craig Moore <craig.moore@qenos.com> Cc: stable@vger.kernel.org Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2015-01-22firewire: ohci: Remove unused functionRickard Strandqvist1-5/+0
Remove the function ar_prev_buffer_index() that is not used anywhere. This was partially found by using a static code analysis program called cppcheck. Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2014-11-19firewire: ohci: replace vm_map_ram() with vmap()Clemens Ladisch1-4/+2
vm_map_ram() is intended for short-lived objects, so using it for the AR buffers could fragment address space, especially on a 32-bit machine. For an allocation that lives as long as the device, vmap() is the better choice. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2014-07-27Merge tag 'firewire-fix-vt6315' of ↵Linus Torvalds1-2/+2
git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 Pull firewire regression fix from Stefan Richter: "IEEE 1394 (FireWire) subsystem fix: MSI don't work on VIA PCIe controllers with some isochronous workloads (regression since v3.16-rc1)" * tag 'firewire-fix-vt6315' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: firewire: ohci: disable MSI for VIA VT6315 again
2014-07-23firewire: ohci: disable MSI for VIA VT6315 againStefan Richter1-2/+2
Revert half of commit d151f9854f21: If isochronous I/O is attempted with packets larget than 1 kByte, VIA VT6315 rev 01 immediately stops to generate any interrupts if MSI are used. Fix this by going back to legacy interrupts. [Thread "Isochronous streaming with VT6315 OHCI", http://marc.info/?t=139049641500003] With smaller packets, the loss of IRQs happens too but only very rarely --- rarely eneough that it was not yet possible for me to determine whether QUIRK_NO_MSI is an actual fix for this rare variation of this chip bug. I am keeping QUIRK_CYCLE_TIMER off of VT6315 rev >= 1 because this has been verified by myself with certainty. On the other hand, I am also keeping QUIRK_CYCLE_TIMER on for VT6315 rev 0 because I don't know at this time whether this revision accesses Cycle Timer non-atomically like most of the other VIA OHCIs are known to do. Reported-by: Rémy Bruno <remy-fw@remy.trinnov.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2014-06-04Merge tag 'firewire-updates' of ↵Linus Torvalds1-0/+7
git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 into next Pull firewire updates from Stefan Richter: "IEEE 1394 (FireWire) subsystem changes: One optimization for some VIA controllers, one fix, one kconfig brushup" * tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: firewire: ohci: enable MSI for VIA VT6315 rev 1, drop cycle timer quirk firewire: Use COMPILE_TEST for build testing firewire: net: fix NULL derefencing in fwnet_probe()
2014-06-03Merge branch 'locking-core-for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next Pull core locking updates from Ingo Molnar: "The main changes in this cycle were: - reduced/streamlined smp_mb__*() interface that allows more usecases and makes the existing ones less buggy, especially in rarer architectures - add rwsem implementation comments - bump up lockdep limits" * 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (33 commits) rwsem: Add comments to explain the meaning of the rwsem's count field lockdep: Increase static allocations arch: Mass conversion of smp_mb__*() arch,doc: Convert smp_mb__*() arch,xtensa: Convert smp_mb__*() arch,x86: Convert smp_mb__*() arch,tile: Convert smp_mb__*() arch,sparc: Convert smp_mb__*() arch,sh: Convert smp_mb__*() arch,score: Convert smp_mb__*() arch,s390: Convert smp_mb__*() arch,powerpc: Convert smp_mb__*() arch,parisc: Convert smp_mb__*() arch,openrisc: Convert smp_mb__*() arch,mn10300: Convert smp_mb__*() arch,mips: Convert smp_mb__*() arch,metag: Convert smp_mb__*() arch,m68k: Convert smp_mb__*() arch,m32r: Convert smp_mb__*() arch,ia64: Convert smp_mb__*() ...
2014-05-29firewire: ohci: enable MSI for VIA VT6315 rev 1, drop cycle timer quirkStefan Richter1-0/+7
Commit af0cdf494781 "firewire: ohci: fix regression with VIA VT6315, disable MSI" acted upon a report against VT6315 rev 0: http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-12/msg02301.html $ lspci -nn VIA Technologies, Inc. VT6315 Series Firewire Controller [1106:3403] I now got a card with $ lspci -nn VIA Technologies, Inc. VT6315 Series Firewire Controller [1106:3403] (rev 01) and this works fine with MSI enabled. Second, I tested this VT6315 rev 1 without CYCLE_TIMER quirk flag using http://me.in-berlin.de/~s5r6/linux1394/utils/test_cycle_time_v20100125.c and found that this chip does in fact access the cycle timer atomically. Things I can't test because I don't have the hardware: - whether VT6315 rev 0 really needs QUIRK_CYCLE_TIMER, - whether the VT6320 PCI device needs QUIRK_CYCLE_TIMER, - whether the VT6325 and VT6330 PCIe devices need QUIRK_CYCLE_TIMER and QUIRK_NO_MSI. Hence, just add a whitelist entry specifically for VT6315 rev >= 1 without any quirk flags. Before this entry we need an extra entry to catch VT6315 rev <= 0 due to how our ID matching logic works. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2014-05-29firewire: revert to 4 GB RDMA, fix protocols using Memory SpaceStefan Richter1-1/+1
Undo a feature introduced in v3.14 by commit fcd46b34425d "firewire: Enable remote DMA above 4 GB". That change raised the minimum address at which protocol drivers and user programs can register for request reception from 0x0001'0000'0000 to 0x8000'0000'0000. It turned out that at least one vendor-specific protocol exists which uses lower addresses: https://bugzilla.kernel.org/show_bug.cgi?id=76921 For the time being, revert most of commit fcd46b34425d so that affected protocols work like with kernel v3.13 and before. Just keep the valid documentation parts from the regressing commit, and the ability to identify controllers which could be programmed to accept >32 bit physical DMA addresses. The rest of fcd46b34425d should probably be brought back as an optional instead of default feature. Reported-by: Fabien Spindler <fabien.spindler@inria.fr> Cc: <stable@vger.kernel.org> # 3.14+ Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2014-04-18arch: Mass conversion of smp_mb__*()Peter Zijlstra1-1/+1
Mostly scripted conversion of the smp_mb__* barriers. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-55dhyhocezdw1dg7u19hmh1u@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-arch@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-03-06firewire: ohci: fix probe failure with Agere/LSI controllersStefan Richter1-13/+2
Since commit bd972688eb24 "firewire: ohci: Fix 'failed to read phy reg' on FW643 rev8", there is a high chance that firewire-ohci fails to initialize LSI née Agere controllers. https://bugzilla.kernel.org/show_bug.cgi?id=65151 Peter Hurley points out the reason: IEEE 1394a:2000 clause 5A.1 (or IEEE 1394:2008 clause 17.2.1) say: "The PHY shall insure that no more than 10 ms elapse from the reassertion of LPS until the interface is reset. The link shall not assert LReq until the reset is complete." In other words, the link needs to give the PHY at least 10 ms to get the interface operational. With just the msleep(1) in bd972688eb24, the first read_phy_reg() during ohci_enable() may happen before the phy-link interface reset was finished, and fail. Due to the high variability of msleep(n) with small n, this failure was not fully reproducible, and not apparent at all with low CONFIG_HZ setting. On the other hand, Peter can no longer reproduce the issue with FW643 rev8. The read phy reg failures that happened back then may have had an unrelated cause. So, just revert bd972688eb24, except for the valid comment on TSB82AA2 cards. Reported-by: Mikhail Gavrilov Reported-by: Jay Fenlason <fenlason@redhat.com> Reported-by: Clemens Ladisch <clemens@ladisch.de> Reported-by: Peter Hurley <peter@hurleysoftware.com> Cc: stable@vger.kernel.org # v3.10+ Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2014-01-20firewire: Enable remote DMA above 4 GBStefan Richter1-3/+5
This makes all of a machine's memory accessible to remote debugging via FireWire, using the physical response unit (i.e. RDMA) of OHCI-1394 link layer controllers. This requires actual support by the controller. The only ones currently known to support it are Agere/LSI FW643. Most if not all other OHCI-1394 controllers do not implement the optional Physical Upper Bound register. With them, RDMA will continue to be limited to the lowermost 4 GB. firewire-ohci's startup message in the kernel log is augmented to tell whether the controller does expose more than 4 GB to RDMA. While OHCI-1394 allows for a maximum Physical Upper Bound of 0xffff'0000'0000 (near 256 TB), this implementation sets it to 0x8000'0000'0000 (128 TB) in order to avoid interference with applications that require interrupt-served asynchronous request reception at respectively low addresses. Note, this change does not switch remote DMA on. It only increases the range of remote access to all memory (instead of just 4 GB) whenever remote DMA was switched on by other means. The latter is achieved by setting firewire-ohci's remote_dma parameter, or if the physical DMA filter is opened through firewire-sbp2. Derived from patch "firewire: Enable physical DMA above 4GB" by Peter Hurley <peter@hurleysoftware.com> from March 27, 2013. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2014-01-12firewire: ohci: Turn remote DMA support into a module parameterLubomir Rintel1-8/+11
This makes it possible to debug kernel over FireWire without the need to recompile it. [Stefan R: changed description from "...0" to "...N"] Cc: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-08-29firewire: ohci: Fix deadlock at bus resetStephan Gatzka1-1/+8
Put bus_reset_work into its own workqueue. By doing this, forward progress of bus_reset_work() is guaranteed if the work is switched over to a rescuer thread. Switching work to a rescuer thread happens if a new worker thread could not be allocated in certain time (MAYDAY_INITIAL_TIMEOUT, typically 10 ms). This might not be possible under high memory pressure or even on a heavily loaded embedded system running a slow serial console. The former deadlock occured in the following situation: The rescuer thread ran fw_device_init->read_config_rom->read_rom->fw_run_transaction. fw_run_transaction blocked waiting for the completion object. This completion object would have been completed in bus_reset_work, but this work was never executed in the rescuer thread due to its strictly sequential behaviour. [Stefan R.: Removed WQ_NON_REENTRANT flag from allocation because it is no longer needed in current kernels. Add it back if you backport to kernels older than 3.7, i.e. one which does not contain dbf2576e37da "workqueue: make all workqueues non-reentrant". Swapped order of destroy_workqueue and pci_unregister_driver.] Signed-off-by: Stephan Gatzka <stephan.gatzka@gmail.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-08-29firewire: ohci: Change module_pci_driver to module_init/module_exitStephan Gatzka1-1/+12
This is a prerequisite to allocate a per driver self_id workqueue. This reverts the ohci.c part of patch fe2af11c220c7bb3a67f7aec0594811e5c59e019. Signed-off-by: Stephan Gatzka <stephan.gatzka@gmail.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-08-19firewire: ohci: beautify some macro definitionsStefan Richter1-9/+9
a) Sort device IDs by vendor -- device -- revision. b) Write quirk flags in hexadecimal. This affects the user-visible output of "modinfo firewire-ohci". Since more flags have been added recently, it is now easier to cope with them in hexadecimal represen- tation. Besides, the device-specific combination of quirk flags is shown in hexadecimal in the kernel log too. (And firewire-sbp2 presents its own quirk flags in modinfo as hexadecimals as well.) Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-08-19firewire: ohci: change confusing name of a struct memberStefan Richter1-5/+5
We have got struct descriptor *descriptors; dma_addr_t descriptors_bus; dma_addr_t buffer_bus; struct descriptor buffer[0]; void *misc_buffer; dma_addr_t misc_buffer_bus; __be32 *config_rom; dma_addr_t config_rom_bus; __be32 *next_config_rom; dma_addr_t next_config_rom_bus; But then we have got __le32 *self_id_cpu; dma_addr_t self_id_bus; Better apply the pattern of xyz vs. xyz_bus to self_id vs. self_id_bus as well. The _cpu suffix looks particularly weird in conversions from little endian to CPU endian. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-07-27firewire: fix libdc1394/FlyCap2 iso event regressionClemens Ladisch1-2/+8
Commit 18d627113b83 (firewire: prevent dropping of completed iso packet header data) was intended to be an obvious bug fix, but libdc1394 and FlyCap2 depend on the old behaviour by ignoring all returned information and thus not noticing that not all packets have been received yet. The result was that the video frame buffers would be saved before they contained the correct data. Reintroduce the old behaviour for old clients. Tested-by: Stepan Salenikovich <stepan.salenikovich@gmail.com> Tested-by: Josep Bosch <jep250@gmail.com> Cc: <stable@vger.kernel.org> # 3.4+ Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-30firewire: ohci: dump_stack() for PHY regs read/write failuresPeter Hurley1-2/+4
A stack trace is an invaluable tool in determining the basis and cause of PHY regs read/write failures. Include PHY reg addr (and value for writes) in the diagnostic. [Stefan R: changed whitespace] Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-30firewire: ohci: Improve bus reset error messagesPeter Hurley1-13/+14
Many of the error messages possible from bus_reset_work() do not contain enough information to distinguish which error condition occurred nor enough information to evaluate the error afterwards. Differentiate all error conditions in bus_reset_work(); add additional information to make error diagnosis possible. [Stefan R: fixed self-ID endian conversion] Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-30firewire: ohci: Alias dev_* log functionsPeter Hurley1-78/+65
Convert dev_xxxx(ohci->card.device, ...) log functions to ohci_xxxx(ohci, ...). [Stefan R: Peter argues that this increases readability of the code.] [Stefan R: changed whitespace] Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-30firewire: ohci: Fix 'failed to read phy reg' on FW643 rev8Peter Hurley1-2/+18
With the LSI FW643 rev 8 [1], the first commanded bus reset at the conclusion of ohci_enable() has been observed to fail with the following messages: [ 4.884015] firewire_ohci 0000:01:00.0: failed to read phy reg .... [ 5.684012] firewire_ohci 0000:01:00.0: failed to read phy reg With drivers/firewire/ohci.c instrumented, the error condition [2] indicates the PHY arbitration state machine has timed out prior to enabling PHY LCtrl. Furthermore, instrumenting ohci_enable() shows that LPS has been enabled within 1 ms. Test LPS latching every 1 ms rather than every 50ms. [1] lspci -v 01:00.0 FireWire (IEEE 1394): LSI Corporation FW643 [TrueFire] PCIe 1394b Controller (rev 08) (prog-if 10 [OHCI]) Subsystem: LSI Corporation FW643 [TrueFire] PCIe 1394b Controller Flags: bus master, fast devsel, latency 0, IRQ 92 Memory at fbeff000 (64-bit, non-prefetchable) [size=4K] Capabilities: [44] Power Management version 3 Capabilities: [4c] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [60] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [140] Virtual Channel Capabilities: [170] Device Serial Number 08-14-43-82-00-00-41-fc Kernel driver in use: firewire_ohci Kernel modules: firewire-ohci [2] instrumented WARNING in read_phy_reg() [ 4.576010] ------------[ cut here ]------------ [ 4.576035] WARNING: at ./drivers/firewire/ohci.c:570 read_phy_reg+0x93/0xe0 [firewire_ohci]() [ 4.576050] Hardware name: Precision WorkStation T5400 [ 4.576058] failed to read phy reg:1 (phy(5) @ config enhance:19) [ 4.576068] Modules linked in: hid_logitech_dj hid_generic(+) usbhid <...snip...> [ 4.576140] Pid: 61, comm: kworker/2:1 Not tainted 3.8.0-2+fwtest-xeon #2+fwtest [ 4.576149] Call Trace: [ 4.576160] [<ffffffff8105468f>] warn_slowpath_common+0x7f/0xc0 [ 4.576168] [<ffffffff81054786>] warn_slowpath_fmt+0x46/0x50 [ 4.576178] [<ffffffffa00caca3>] read_phy_reg+0x93/0xe0 [firewire_ohci] [ 4.576188] [<ffffffffa00cae19>] ohci_read_phy_reg+0x39/0x60 [firewire_ohci] [ 4.576203] [<ffffffffa00731ff>] fw_send_phy_config+0xbf/0xe0 [firewire_core] [ 4.576214] [<ffffffffa006b2d6>] br_work+0x46/0xb0 [firewire_core] [ 4.576225] [<ffffffff81071e0c>] process_one_work+0x13c/0x500 [ 4.576238] [<ffffffffa006b290>] ? fw_card_initialize+0x180/0x180 [firewire_core] [ 4.576248] [<ffffffff810737ed>] worker_thread+0x16d/0x470 [ 4.576257] [<ffffffff81073680>] ? busy_worker_rebind_fn+0x100/0x100 [ 4.576266] [<ffffffff8107d160>] kthread+0xc0/0xd0 [ 4.576275] [<ffffffff816a0000>] ? pcpu_dump_alloc_info+0x1cb/0x2c4 [ 4.576284] [<ffffffff8107d0a0>] ? kthread_create_on_node+0x130/0x130 [ 4.576297] [<ffffffff816b2f6c>] ret_from_fork+0x7c/0xb0 [ 4.576305] [<ffffffff8107d0a0>] ? kthread_create_on_node+0x130/0x130 [ 4.576313] ---[ end trace cbc940994b300302 ]--- [Stefan R: Peter also reports a change of behavior with LSI FW323. Before the patch, there would often occur a lock transaction failure during firewire-core startup: [ 6.056022] firewire_core 0000:07:06.0: BM lock failed (timeout), making local node (ffc0) root This failure no longer happens after the patch, without an obvious reason for the failure or the fix.] [Stefan R: Added quirk flag, quirk table entry, and comment.] Reported-by: Tim Jordan <tim@insipid.org.uk> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-28firewire: ohci: fix VIA VT6306 video receptionAndy Leiserson1-3/+35
Add quirk for VT6306 wake bit behavior. VT6306 seems to reread the wrong descriptor when the wake bit is written. work around by putting a copy of the branch address in the first descriptor of the block. [Stefan R: This fixes the known broken video reception via gstreamer on VIA VT6306. 100% repeatable testcase: $ gst-launch-0.10 dv1394src \! dvdemux \! dvdec \! xvimagesink with a camcorder or other DV source connected. Likewise for MPEG2-TS reception via gstreamer, e.g. from TV settop boxes. Perhaps this also fixes dv4l on VT6306, but this is as yet untested. Kino, dvgrab or FFADO had not been affected by this chip quirk. Additional comments from Andy:] I've looked into some problems with the wake bit on a vt6306 family chip (1106:3044, rev 46). I used this firewire card in a mythtv setup (ISO receive MPEG2 stream) with Debian 2.6.32 kernels for ~2 years without problems. Since upgrading to 3.2, I've been having problems with the input stream freezing -- input data stops until I restart mythtv (I expect closing and reopening the device would be sufficient). This happens infrequently, maybe one out of 20 recordings. I eventually determined that the problem is more likely to occur if the system is loaded. I isolated the kernel version as the triggering SW factor and then specifically the change from dualbuffer back to packet-per-buffer DMA mode. The possibility that the controller does not properly respond to the wake bit was suggested in https://bugzilla.redhat.com/show_bug.cgi?id=415841, but not proven. Based on the fact that dualbuffer mode worked while packet-per-buffer has trouble, I guessed that upon seeing the wake bit written, the vt6306 controller only checks the branch address in the first descriptor of the block, even if that is not the correct place to look (because the block has multiple descriptors). This theory seems to be correct. When the ISO reception is hung, I am able to resume it by manually writing the branch address to the first descriptor in the block, and then writing the wake bit. I've had luck so far with the attached patch, so I'm including it. It's probably not a complete solution -- I haven't tested transmit modes to see whether they have a similar issue. I doubt that the quirk test is any cheaper than just writing the extra branch address in all cases, but it does reduce the risk of breaking other hardware. [Stefan R: omitted QUIRK_NO_MSI from VT6306 quirks table entry, changed whitespace] Signed-off-by: Andy Leiserson <andy@leiserson.org> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-28firewire: ohci: Check LPS before register access on pci removalPeter Hurley1-4/+9
A pci device can be removed while in its suspended state. If the ohci host controller is suspended, the PHY is also in low-power mode and LPS is disabled. If LPS is disabled, most of the host registers aren't accessible, including IntMaskClear. Furthermore, access to these registers when LPS is disabled can cause hard lockups on some hardware. Since interrupts are already disabled in this mode, further action is unnecessary. Test LPS before attempting to write IntMaskClear to disable interrupts. [Stefan R: whitespace changes] Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-28firewire: ohci: Fix double free_irq()Peter Hurley1-22/+16
A pci device can be removed while in its suspended state. Because the ohci driver freed the irq to suspend, free_irq() is called twice; once from pci_remove() and again from pci_suspend(), which issues the warning below [1]. Rather than allocate the irq in the .enable() path, move the allocation to .probe(). Consequently, the irq is not reallocated upon pci_resume() and thus is not freed upon pci_suspend(). [1] Warning reported by Mark Einon <mark.einon@gmail.com> when suspending an MSI MS-1727 GT740 laptop on Ubuntu 3.5.0-22-generic WARNING: at ./kernel/irq/manage.c:1198 __free_irq+0xa3/0x1e0() Hardware name: MS-1727 Trying to free already-free IRQ 16 Modules linked in: ip6table_filter ip6_tables ebtable_nat ebtables <...snip...> Pid: 4, comm: kworker/0:0 Tainted: P O 3.5.0-22-generic #34-Ubuntu Call Trace: [<ffffffff81051c1f>] warn_slowpath_common+0x7f/0xc0 [<ffffffff81051d16>] warn_slowpath_fmt+0x46/0x50 [<ffffffff8103fa39>] ? default_spin_lock_flags+0x9/0x10 [<ffffffff810df6b3>] __free_irq+0xa3/0x1e0 [<ffffffff810df844>] free_irq+0x54/0xc0 [<ffffffffa005a27e>] pci_remove+0x6e/0x210 [firewire_ohci] [<ffffffff8135ae7f>] pci_device_remove+0x3f/0x110 [<ffffffff8141fdbc>] __device_release_driver+0x7c/0xe0 [<ffffffff8141fe4c>] device_release_driver+0x2c/0x40 [<ffffffff8141f5f1>] bus_remove_device+0xe1/0x120 [<ffffffff8141cd1a>] device_del+0x12a/0x1c0 [<ffffffff8141cdc6>] device_unregister+0x16/0x30 [<ffffffff81354784>] pci_stop_bus_device+0x94/0xa0 [<ffffffffa0091c67>] acpiphp_disable_slot+0xb7/0x1a0 [acpiphp] [<ffffffffa0090716>] ? get_slot_status+0x46/0xc0 [acpiphp] [<ffffffffa0091d7d>] acpiphp_check_bridge.isra.15+0x2d/0xf0 [acpiphp] [<ffffffffa0092442>] _handle_hotplug_event_bridge+0x372/0x4d0 [acpiphp] [<ffffffff81390f8c>] ? acpi_os_execute_deferred+0x2f/0x34 [<ffffffff8116e22d>] ? kfree+0xed/0x110 [<ffffffff8107086a>] process_one_work+0x12a/0x420 [<ffffffffa00920d0>] ? _handle_hotplug_event_func+0x1d0/0x1d0 [acpiphp] [<ffffffff8107141e>] worker_thread+0x12e/0x2f0 [<ffffffff810712f0>] ? manage_workers.isra.26+0x200/0x200 [<ffffffff81075f13>] kthread+0x93/0xa0 [<ffffffff8168d024>] kernel_thread_helper+0x4/0x10 [<ffffffff81075e80>] ? kthread_freezable_should_stop+0x70/0x70 [<ffffffff8168d020>] ? gs_change+0x13/0x13 Reported-by: Mark Einon <mark.einon@gmail.com> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-28firewire: remove unnecessary alloc/OOM messagesStefan Richter1-3/+0
These are redundant to log messages from the mm core. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-04-28firewire: Remove two unneeded checks for macrosPaul Bolle1-2/+0
The old IEEE 1394 driver stack was removed in v2.6.37. That made the checks for two Kconfig (module) macros unneeded, since they will now always evaluate to true. Remove these two checks. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2013-01-29Merge branch 'master' into for-nextJiri Kosina1-1/+1
Conflicts: drivers/devfreq/exynos4_bus.c Sync with Linus' tree to be able to apply patches that are against newer code (mvneta).
2013-01-09treewide: Fix typo in various driversMasanari Iida1-1/+1
Correct spelling typo in printk within various drivers. Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2012-12-13Merge branch 'for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial branch from Jiri Kosina: "Usual stuff -- comment/printk typo fixes, documentation updates, dead code elimination." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits) HOWTO: fix double words typo x86 mtrr: fix comment typo in mtrr_bp_init propagate name change to comments in kernel source doc: Update the name of profiling based on sysfs treewide: Fix typos in various drivers treewide: Fix typos in various Kconfig wireless: mwifiex: Fix typo in wireless/mwifiex driver messages: i2o: Fix typo in messages/i2o scripts/kernel-doc: check that non-void fcts describe their return value Kernel-doc: Convention: Use a "Return" section to describe return values radeon: Fix typo and copy/paste error in comments doc: Remove unnecessary declarations from Documentation/accounting/getdelays.c various: Fix spelling of "asynchronous" in comments. Fix misspellings of "whether" in comments. eisa: Fix spelling of "asynchronous". various: Fix spelling of "registered" in comments. doc: fix quite a few typos within Documentation target: iscsi: fix comment typos in target/iscsi drivers treewide: fix typo of "suport" in various comments and Kconfig treewide: fix typo of "suppport" in various comments ...
2012-11-28firewire: remove use of __devinitBill Pemberton1-1/+1
CONFIG_HOTPLUG is going away as an option so __devinit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-19various: Fix spelling of "asynchronous" in comments.Adam Buchbinder1-1/+1
"Asynchronous" is misspelled in some comments. No code changes. Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2012-09-25firewire: ohci: get IR bit from TSB41BA3D phyStephan Gatzka1-1/+27
In case of a self constructed selfID packet this patch correctly determines the information if the TSB41BA3D phy initiated a bus reset. Signed-off-by: Stephan Gatzka <stephan.gatzka@gmail.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2012-06-17firewire: ohci: initialize multiChanMode bits after resetClemens Ladisch1-0/+5
OHCI 1.1 says: | Since the value of this bit is undefined after reset in all IR | contexts, software shall initialize this bit to zero in all contexts | whether or not active to maintain the exclusive nature of this bit. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2012-06-05firewire: ohci: sanity-check MMIO resourceClemens Ladisch1-0/+7
pci_request_region() does not fail on resources that have not been allocated by the BIOS or by the kernel, so to avoid accessing registers that are not there, we have to check for this explicitly. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2012-05-27firewire: ohci: lazy bus time initializationClemens Ladisch1-6/+12
The Bus_Time CSR is virtually never used, so we can avoid burning CPU in interrupt context for 1 or 3 IsochronousCycleTimer accesses every minute by not tracking the bus time until the CSR is actually accessed for the first time. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2012-04-17firewire: ohci: omit spinlock IRQ flags where possibleStefan Richter1-13/+10
bus_reset_work() is only called from workqueue thread context. ohci_set_config_rom() and ohci_allocate_iso_context() perform GFP_KERNEL memory allocations, therefore they must be called with interrupts enabled. Hence these functions may disable and enable local IRQs without having to track IRQ state. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2012-04-17firewire: ohci: correct signedness of a local variableStefan Richter1-2/+2
bus_reset_work's reg is a bitfield. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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