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2010-05-14Merge branch 'davinci-fixes-for-linus-2' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci * 'davinci-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci: DA830: fix USB 2.0 clock entry
2010-05-14DA830: fix USB 2.0 clock entrySergei Shtylyov1-1/+1
DA8xx OHCI driver fails to load due to failing clk_get() call for the USB 2.0 clock. Arrange matching USB 2.0 clock by the clock name instead of the device. (Adding another CLK() entry for "ohci.0" device won't do -- in the future I'll also have to enable USB 2.0 clock to configure CPPI 4.1 module, in which case I won't have any device at all.) Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
2010-05-14Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds1-1/+6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: vhost: fix barrier pairing
2010-05-14Merge branch 'for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: mmap_min_addr check CAP_SYS_RAWIO only for write
2010-05-14Merge branch 'for-linus' of git://git.monstr.eu/linux-2.6-microblazeLinus Torvalds8-20/+89
* 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze: microblaze: Fix module loading on system with WB cache microblaze: export assembly functions used by modules microblaze: Remove powerpc code from Microblaze port microblaze: Remove compilation warnings in cache macro microblaze: export assembly functions used by modules microblaze: fix get_user/put_user side-effects microblaze: re-enable interrupts before calling schedule
2010-05-14Merge branch 'net-2.6' of ↵David S. Miller1-1/+6
git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
2010-05-14mmap_min_addr check CAP_SYS_RAWIO only for writeKees Cook1-1/+1
Redirecting directly to lsm, here's the patch discussed on lkml: http://lkml.org/lkml/2010/4/22/219 The mmap_min_addr value is useful information for an admin to see without being root ("is my system vulnerable to kernel NULL pointer attacks?") and its setting is trivially easy for an attacker to determine by calling mmap() in PAGE_SIZE increments starting at 0, so trying to keep it private has no value. Only require CAP_SYS_RAWIO if changing the value, not reading it. Comment from Serge : Me, I like to write my passwords with light blue pen on dark blue paper, pasted on my window - if you're going to get my password, you're gonna get a headache. Signed-off-by: Kees Cook <kees.cook@canonical.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org> (cherry picked from commit 822cceec7248013821d655545ea45d1c6a9d15b3)
2010-05-14microblaze: Fix module loading on system with WB cacheMichal Simek1-0/+2
There is necessary to flush whole dcache. Icache work should be done in kernel/module.c. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-05-13Merge branch 'for-linus' of ↵Linus Torvalds2-0/+7
git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6: mfd: Clean up after WM83xx AUXADC interrupt if it arrives late
2010-05-13Merge branch 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds6-23/+26
* 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: PPC: Keep index within boundaries in kvmppc_44x_emul_tlbwe() KVM: VMX: blocked-by-sti must not defer NMI injections KVM: x86: Call vcpu_load and vcpu_put in cpuid_update KVM: SVM: Fix wrong intercept masks on 32 bit KVM: convert ioapic lock to spinlock
2010-05-13Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6Linus Torvalds3-2/+11
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: serial: imx.c: fix CTS trigger level lower to avoid lost chars tty: Fix unbalanced BKL handling in error path serial: mpc52xx_uart: fix null pointer dereference
2010-05-13serial: imx.c: fix CTS trigger level lower to avoid lost charsValentin Longchamp1-1/+9
The imx CTS trigger level is left at its reset value that is 32 chars. Since the RX FIFO has 32 entries, when CTS is raised, the FIFO already is full. However, some serial port devices first empty their TX FIFO before stopping when CTS is raised, resulting in lost chars. This patch sets the trigger level lower so that other chars arrive after CTS is raised, there is still room for 16 of them. Signed-off-by: Valentin Longchamp<valentin.longchamp@epfl.ch> Tested-by: Philippe Rétornaz<philippe.retornaz@epfl.ch> Acked-by: Wolfram Sang<w.sang@pengutronix.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-05-13tty: Fix unbalanced BKL handling in error pathAlan Cox1-0/+1
Arnd noted: After the "retry_open:" label, we first get the tty_mutex and then the BKL. However a the end of tty_open, we jump back to retry_open with the BKL still held. If we run into this case, the tty_open function will be left with the BKL still held. Signed-off-by: Alan Cox <alan@linux.intel.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-05-13serial: mpc52xx_uart: fix null pointer dereferenceAnatolij Gustschin1-1/+1
Commit 6acc6833510db8f72b5ef343296d97480555fda9 introduced NULL pointer dereference and kernel crash on ppc32 machines while booting. Fix this bug now. Reported-by: Leonardo Chiquitto <leonardo.lists@gmail.com> Tested-by: Leonardo Chiquitto <leonardo.lists@gmail.com> Signed-off-by: Anatolij Gustschin <agust@denx.de> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-05-13Merge branch 'for-linus' of ↵Linus Torvalds2-2/+20
git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: cifs: guard against hardlinking directories
2010-05-13vfs: Fix O_NOFOLLOW behavior for paths with trailing slashesJan Kara1-2/+4
According to specification mkdir d; ln -s d a; open("a/", O_NOFOLLOW | O_RDONLY) should return success but currently it returns ELOOP. This is a regression caused by path lookup cleanup patch series. Fix the code to ignore O_NOFOLLOW in case the provided path has trailing slashes. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Reported-by: Marius Tolzmann <tolzmann@molgen.mpg.de> Acked-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-13Merge branch 'for-linus' of ↵Linus Torvalds5-8/+30
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: ALSA: ice1724 - Fix ESI Maya44 capture source control ALSA: pcm - Use pgprot_noncached() for MIPS non-coherent archs ALSA: virtuoso: fix Xonar D1/DX front panel microphone ALSA: hda - Add hp-dv4 model for IDT 92HD71bx ALSA: hda - Fix mute-LED GPIO pin for HP dv series ALSA: hda: Fix 0 dB for Lenovo models using Conexant CX20549 (Venice)
2010-05-13Merge branch 'for-linus' of ↵Linus Torvalds6-23/+42
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: ad7877 - keep dma rx buffers in seperate cache lines Input: psmouse - reset all types of mice before reconnecting Input: elantech - use all 3 bytes when checking version Input: iforce - fix Guillemot Jet Leader 3D entry Input: iforce - add Guillemot Jet Leader Force Feedback
2010-05-13mfd: Clean up after WM83xx AUXADC interrupt if it arrives lateMark Brown2-0/+7
In certain circumstances, especially under heavy load, the AUXADC completion interrupt may be detected after we've timed out waiting for it. That conversion would still succeed but the next conversion will see the completion that was signalled by the interrupt for the previous conversion and therefore not wait for the AUXADC conversion to run, causing it to report failure. Provide a simple, non-invasive cleanup by using try_wait_for_completion() to ensure that the completion is not signalled before we wait. Since the AUXADC is run within a mutex we know there can only have been at most one AUXADC interrupt outstanding. A more involved change should follow for the next merge window. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2010-05-13microblaze: export assembly functions used by modulesMichal Simek3-0/+3
Export __strncpy_user, memory_size, ioremap_bot for modules. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-05-13microblaze: Remove powerpc code from Microblaze portMichal Simek1-1/+1
Remove eeh_add_device_tree_late which is powerpc specific code. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-05-13microblaze: Remove compilation warnings in cache macroMichal Simek1-1/+2
CC arch/microblaze/kernel/cpu/cache.o arch/microblaze/kernel/cpu/cache.c: In function '__invalidate_dcache_range_wb': arch/microblaze/kernel/cpu/cache.c:398: warning: ISO C90 forbids mixed declarations and code arch/microblaze/kernel/cpu/cache.c: In function '__flush_dcache_range_wb': arch/microblaze/kernel/cpu/cache.c:509: warning: ISO C90 forbids mixed declara Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-05-13microblaze: export assembly functions used by modulesSteven J. Magnani1-0/+10
Modules that use copy_{to,from}_user(), memcpy(), and memset() fail to build in certain circumstances. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-05-13Merge branch 'fix/hda' into for-linusTakashi Iwai3-10/+20
2010-05-13Input: ad7877 - keep dma rx buffers in seperate cache linesOskar Schirmer1-3/+12
With dma based spi transmission, data corruption is observed occasionally. With dma buffers located right next to msg and xfer fields, cache lines correctly flushed in preparation for dma usage may be polluted again when writing to fields in the same cache line. Make sure cache fields used with dma do not share cache lines with fields changed during dma handling. As both fields are part of a struct that is allocated via kzalloc, thus cache aligned, moving the fields to the 1st position and insert padding for alignment does the job. Signed-off-by: Oskar Schirmer <os@emlix.com> Signed-off-by: Daniel Glöckner <dg@emlix.com> Signed-off-by: Oliver Schneidewind <osw@emlix.com> Signed-off-by: Johannes Weiner <jw@emlix.com> Acked-by: Mike Frysinger <vapier@gentoo.org> [dtor@mail.ru - changed to use ___cacheline_aligned as suggested by akpm] Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-05-13Input: psmouse - reset all types of mice before reconnectingDmitry Torokhov1-4/+10
Synaptics hardware requires resetting device after suspend to ram in order for the device to be operational. The reset lives in synaptics-specific reconnect handler, but it is not being invoked if synaptics support is disabled and the device is handled as a standard PS/2 device (bare or IntelliMouse protocol). Let's add reset into generic reconnect handler as well. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-05-13Input: elantech - use all 3 bytes when checking versionDmitry Torokhov2-15/+14
Apparently all 3 bytes returned by ETP_FW_VERSION_QUERY are significant and should be taken into account when matching hardware version/features. Tested-by: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-05-13microblaze: fix get_user/put_user side-effectsSteven J. Magnani1-18/+69
The Microblaze implementations of get_user() and (MMU) put_user() evaluate the address argument more than once. This causes unexpected side-effects for invocations that include increment operators, i.e. get_user(foo, bar++). This patch also removes the distinction between MMU and noMMU put_user(). Without the patch: $ echo 1234567890 > /proc/sys/kernel/core_pattern $ cat /proc/sys/kernel/core_pattern 12345 Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
2010-05-13microblaze: re-enable interrupts before calling scheduleSteven J. Magnani1-0/+2
schedule() should not be called with interrupts disabled. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-05-13KVM: PPC: Keep index within boundaries in kvmppc_44x_emul_tlbwe()Roel Kluin1-1/+1
An index of KVM44x_GUEST_TLB_SIZE is already one too large. Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Acked-by: Hollis Blanchard <hollis@penguinppc.org> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-13KVM: VMX: blocked-by-sti must not defer NMI injectionsJan Kiszka1-2/+1
As the processor may not consider GUEST_INTR_STATE_STI as a reason for blocking NMI, it could return immediately with EXIT_REASON_NMI_WINDOW when we asked for it. But as we consider this state as NMI-blocking, we can run into an endless loop. Resolve this by allowing NMI injection if just GUEST_INTR_STATE_STI is active (originally suggested by Gleb). Intel confirmed that this is safe, the processor will never complain about NMI injection in this state. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> KVM-Stable-Tag Acked-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-13KVM: x86: Call vcpu_load and vcpu_put in cpuid_updateDongxiao Xu1-0/+4
cpuid_update may operate VMCS, so vcpu_load() and vcpu_put() should be called to ensure correctness. Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-13KVM: SVM: Fix wrong intercept masks on 32 bitJoerg Roedel1-4/+4
This patch makes KVM on 32 bit SVM working again by correcting the masks used for iret interception. With the wrong masks the upper 32 bits of the intercepts are masked out which leaves vmrun unintercepted. This is not legal on svm and the vmrun fails. Bug was introduced by commits 95ba827313 and 3cfc3092. Cc: Jan Kiszka <jan.kiszka@siemens.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: stable@kernel.org Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-13KVM: convert ioapic lock to spinlockMarcelo Tosatti2-16/+16
kvm_set_irq is used from non sleepable contexes, so convert ioapic from mutex to spinlock. KVM-Stable-Tag. Tested-by: Ralf Bonenkamp <ralf.bonenkamp@swyx.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-12Merge branch 'merge' of ↵Linus Torvalds6-68/+51
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: powerpc/perf_event: Fix oops due to perf_event_do_pending call powerpc/swiotlb: Fix off by one in determining boundary of which ops to use
2010-05-12Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6Linus Torvalds4-12/+14
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: [S390] correct address of _stext with CONFIG_SHARED_KERNEL=y [S390] ptrace: fix return value of do_syscall_trace_enter() [S390] dasd: fix race between tasklet and dasd_sleep_on
2010-05-12Merge branch 'for-linus' of ↵Linus Torvalds12-49/+116
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: ceph: preserve seq # on requeued messages after transient transport errors ceph: fix cap removal races ceph: zero unused message header, footer fields ceph: fix locking for waking session requests after reconnect ceph: resubmit requests on pg mapping change (not just primary change) ceph: fix open file counting on snapped inodes when mds returns no caps ceph: unregister osd request on failure ceph: don't use writeback_control in writepages completion ceph: unregister bdi before kill_anon_super releases device name
2010-05-13Merge commit 'kumar/merge' into mergeBenjamin Herrenschmidt1-2/+3
2010-05-12Revert "PCI: update bridge resources to get more big ranges in PCI assign ↵Linus Torvalds1-112/+2
unssigned" This reverts commit 977d17bb1749517b353874ccdc9b85abc7a58c2a, because it can cause problems with some devices not getting any resources at all when the resource tree is re-allocated. For an example of this, see https://bugzilla.kernel.org/show_bug.cgi?id=15960 (originally https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4982) (lkml thread: http://lkml.org/lkml/2010/4/19/20) where Peter Henriksson reported his Xonar DX sound card gone, because the IO port region was no longer allocated. Reported-bisected-and-tested-by: Peter Henriksson <peter.henriksson@gmail.com> Requested-by: Andrew Morton <akpm@linux-foundation.org> Requested-by: Clemens Ladisch <clemens@ladisch.de> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-12CacheFiles: Fix error handling in cachefiles_determine_cache_security()David Howells1-0/+4
cachefiles_determine_cache_security() is expected to return with a security override in place. However, if set_create_files_as() fails, we fail to do this. In this case, we should just reinstate the security override that was set by the caller. Furthermore, if set_create_files_as() fails, we should dispose of the new credentials we were in the process of creating. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-12rwsem: Test for no active locks in __rwsem_do_wake undo codeMichel Lespinasse1-2/+3
If there are no active threasd using a semaphore, it is always correct to unqueue blocked threads. This seems to be what was intended in the undo code. What was done instead, was to look for a sem count of zero - this is an impossible situation, given that at least one thread is known to be queued on the semaphore. The code might be correct as written, but it's hard to reason about and it's not what was intended (otherwise the goto out would have been unconditional). Go for checking the active count - the alternative is not worth the headache. Signed-off-by: Michel Lespinasse <walken@google.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-12vhost: fix barrier pairingMichael S. Tsirkin1-1/+6
According to memory-barriers.txt, an smp memory barrier in guest should always be paired with an smp memory barrier in host, and I quote "a lack of appropriate pairing is almost certainly an error". In case of vhost, failure to flush out used index update before looking at the interrupt disable flag could result in missed interrupts, resulting in networking hang under stress. This might happen when flags read bypasses used index write. So we see interrupts disabled and do not interrupt, at the same time guest writes flags value to enable interrupt, reads an old used index value, thinks that used ring is empty and waits for interrupt. Note: the barrier we pair with here is in drivers/virtio/virtio_ring.c, function vring_enable_cb. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Juan Quintela <quintela@redhat.com>
2010-05-12ALSA: ice1724 - Fix ESI Maya44 capture source controlTakashi Iwai1-3/+3
The capture source control of maya44 was wrongly coded with the bit shift instead of the bit mask. Also, the slot for line-in was wrongly assigned (slot 5 instead of 4). Reported-by: Alex Chernyshoff <alexdsp@gmail.com> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-05-12ALSA: pcm - Use pgprot_noncached() for MIPS non-coherent archsTakashi Iwai1-0/+7
MIPS non-coherent archs need the noncached pgprot in mmap of PCM buffers. But, since the coherency needs to be checked dynamically via plat_device_is_coherent(), we need an ugly check dependent on MIPS in ALSA core code. This should be cleaned up in MIPS arch side (e.g. creating dma_mmap_coherent()) in near future. Tested-by: Wu Zhangjin <wuzhangjin@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-05-12ALSA: virtuoso: fix Xonar D1/DX front panel microphoneClemens Ladisch1-0/+3
Commit 65c3ac885ce9852852b895a4a62212f62cb5f2e9 in 2.6.33 accidentally left out the initialization of the AC97 codec FMIC2MIC bit, which broke recording from the front panel microphone. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Cc: <stable@kernel.org> Signed-off-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-05-12ALSA: hda - Add hp-dv4 model for IDT 92HD71bxTakashi Iwai1-3/+9
It turned out that HP dv series have inconsistent the mute-LED GPIO mapping among various models. dv4/7 seem to use GPIO 0 while dv 5/6 seem to use GPIO 3. The previous commit 26ebe0a28986f4845b2c5bea43ac5cc0b9f27f0a ALSA: hda - Fix mute-LED GPIO pin for HP dv series breaks dv5/6. This patch adds the new quirk model, hp-dv4, to handle HP dv4/7 separately from HP dv5/6. Tested-by: Kunal Gangakhedkar <kunal.gangakhedkar@gmail.com> (for dv6-1110ax) Acked-by: Kunal Gangakhedkar <kunal.gangakhedkar@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-05-12[S390] correct address of _stext with CONFIG_SHARED_KERNEL=yMartin Schwidefsky2-2/+2
As of git commit 1844c9bc0b2fed3023551c1affe033ab38e90b9a head64.S/head31.S are not included in head.S anymore but build as an extra object. This breaks shared kernel support because the .org statement in head64.S/head31.S for CONFIG_SHARED_KERNEL=y will have a different effect. The end address of the head.text section in head.o will be added to the .org value, to compensate for this subtract 0x11000 to get the required value of 0x100000 again. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-05-12[S390] ptrace: fix return value of do_syscall_trace_enter()Gerald Schaefer1-3/+2
strace may change the system call number, so regs->gprs[2] must not be read before tracehook_report_syscall_entry(). This fixes a bug where "strace -f" will hang after a vfork(). Cc: <stable@kernel.org> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-05-12[S390] dasd: fix race between tasklet and dasd_sleep_onStefan Weinhuber1-7/+10
The various dasd_sleep_on functions use a global wait queue when waiting for a cqr. The wait condition checks the status and devlist fields of the cqr to determine if it is safe to continue. This evaluation may return true, although the tasklet has not finished processing of the cqr and the callback function has not been called yet. When the callback is finally called, the data in the cqr may already be invalid. The sleep_on wait condition needs a safe way to determine if the tasklet has finished processing. Use the callback_data field of the cqr to store a token, which is set by the callback function itself. Cc: <stable@kernel.org> Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-05-12powerpc/perf_event: Fix oops due to perf_event_do_pending callPaul Mackerras5-66/+48
Anton Blanchard found that large POWER systems would occasionally crash in the exception exit path when profiling with perf_events. The symptom was that an interrupt would occur late in the exit path when the MSR[RI] (recoverable interrupt) bit was clear. Interrupts should be hard-disabled at this point but they were enabled. Because the interrupt was not recoverable the system panicked. The reason is that the exception exit path was calling perf_event_do_pending after hard-disabling interrupts, and perf_event_do_pending will re-enable interrupts. The simplest and cleanest fix for this is to use the same mechanism that 32-bit powerpc does, namely to cause a self-IPI by setting the decrementer to 1. This means we can remove the tests in the exception exit path and raw_local_irq_restore. This also makes sure that the call to perf_event_do_pending from timer_interrupt() happens within irq_enter/irq_exit. (Note that calling perf_event_do_pending from timer_interrupt does not mean that there is a possible 1/HZ latency; setting the decrementer to 1 ensures that the timer interrupt will happen immediately, i.e. within one timebase tick, which is a few nanoseconds or 10s of nanoseconds.) Signed-off-by: Paul Mackerras <paulus@samba.org> Cc: stable@kernel.org Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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