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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-07 13:14:19 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-07 13:14:19 -0800 |
commit | ad4a4a82d176962ea706db555b29821af0b4dd45 (patch) | |
tree | f7b9c8dc86fc9de64211c7cc4af911e9e2e08bf9 | |
parent | 6277d53a9ff34ecd3837690b243aa8c8c993898d (diff) | |
parent | 0c2bd9b24e73287aa4ee87844c847205e0da8a9b (diff) | |
download | linux-ad4a4a82d176962ea706db555b29821af0b4dd45.tar.bz2 |
Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
[S390] tape: deadlock on system work queue
[S390] keyboard: integer underflow bug
[S390] xpram: remove __initdata attribute from module parameters
-rw-r--r-- | drivers/s390/block/xpram.c | 4 | ||||
-rw-r--r-- | drivers/s390/char/keyboard.c | 3 | ||||
-rw-r--r-- | drivers/s390/char/tape.h | 8 | ||||
-rw-r--r-- | drivers/s390/char/tape_34xx.c | 59 | ||||
-rw-r--r-- | drivers/s390/char/tape_3590.c | 83 |
5 files changed, 120 insertions, 37 deletions
diff --git a/drivers/s390/block/xpram.c b/drivers/s390/block/xpram.c index c881a14fa5dd..1f6a4d894e73 100644 --- a/drivers/s390/block/xpram.c +++ b/drivers/s390/block/xpram.c @@ -62,8 +62,8 @@ static int xpram_devs; /* * Parameter parsing functions. */ -static int __initdata devs = XPRAM_DEVS; -static char __initdata *sizes[XPRAM_MAX_DEVS]; +static int devs = XPRAM_DEVS; +static char *sizes[XPRAM_MAX_DEVS]; module_param(devs, int, 0); module_param_array(sizes, charp, NULL, 0); diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c index 8cd58e412b5e..5ad44daef73b 100644 --- a/drivers/s390/char/keyboard.c +++ b/drivers/s390/char/keyboard.c @@ -460,7 +460,8 @@ kbd_ioctl(struct kbd_data *kbd, struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp; - int ct, perm; + unsigned int ct; + int perm; argp = (void __user *)arg; diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h index 7a242f073632..267b54e8ff5a 100644 --- a/drivers/s390/char/tape.h +++ b/drivers/s390/char/tape.h @@ -280,6 +280,14 @@ tape_do_io_free(struct tape_device *device, struct tape_request *request) return rc; } +static inline void +tape_do_io_async_free(struct tape_device *device, struct tape_request *request) +{ + request->callback = (void *) tape_free_request; + request->callback_data = NULL; + tape_do_io_async(device, request); +} + extern int tape_oper_handler(int irq, int status); extern void tape_noper_handler(int irq, int status); extern int tape_open(struct tape_device *); diff --git a/drivers/s390/char/tape_34xx.c b/drivers/s390/char/tape_34xx.c index c17f35b6136a..c26511171ffe 100644 --- a/drivers/s390/char/tape_34xx.c +++ b/drivers/s390/char/tape_34xx.c @@ -53,23 +53,11 @@ static void tape_34xx_delete_sbid_from(struct tape_device *, int); * Medium sense for 34xx tapes. There is no 'real' medium sense call. * So we just do a normal sense. */ -static int -tape_34xx_medium_sense(struct tape_device *device) +static void __tape_34xx_medium_sense(struct tape_request *request) { - struct tape_request *request; - unsigned char *sense; - int rc; - - request = tape_alloc_request(1, 32); - if (IS_ERR(request)) { - DBF_EXCEPTION(6, "MSEN fail\n"); - return PTR_ERR(request); - } - - request->op = TO_MSEN; - tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); + struct tape_device *device = request->device; + unsigned char *sense; - rc = tape_do_io_interruptible(device, request); if (request->rc == 0) { sense = request->cpdata; @@ -88,15 +76,47 @@ tape_34xx_medium_sense(struct tape_device *device) device->tape_generic_status |= GMT_WR_PROT(~0); else device->tape_generic_status &= ~GMT_WR_PROT(~0); - } else { + } else DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n", request->rc); - } tape_free_request(request); +} + +static int tape_34xx_medium_sense(struct tape_device *device) +{ + struct tape_request *request; + int rc; + + request = tape_alloc_request(1, 32); + if (IS_ERR(request)) { + DBF_EXCEPTION(6, "MSEN fail\n"); + return PTR_ERR(request); + } + request->op = TO_MSEN; + tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); + rc = tape_do_io_interruptible(device, request); + __tape_34xx_medium_sense(request); return rc; } +static void tape_34xx_medium_sense_async(struct tape_device *device) +{ + struct tape_request *request; + + request = tape_alloc_request(1, 32); + if (IS_ERR(request)) { + DBF_EXCEPTION(6, "MSEN fail\n"); + return; + } + + request->op = TO_MSEN; + tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); + request->callback = (void *) __tape_34xx_medium_sense; + request->callback_data = NULL; + tape_do_io_async(device, request); +} + struct tape_34xx_work { struct tape_device *device; enum tape_op op; @@ -109,6 +129,9 @@ struct tape_34xx_work { * is inserted but cannot call tape_do_io* from an interrupt context. * Maybe that's useful for other actions we want to start from the * interrupt handler. + * Note: the work handler is called by the system work queue. The tape + * commands started by the handler need to be asynchrounous, otherwise + * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq). */ static void tape_34xx_work_handler(struct work_struct *work) @@ -119,7 +142,7 @@ tape_34xx_work_handler(struct work_struct *work) switch(p->op) { case TO_MSEN: - tape_34xx_medium_sense(device); + tape_34xx_medium_sense_async(device); break; default: DBF_EVENT(3, "T34XX: internal error: unknown work\n"); diff --git a/drivers/s390/char/tape_3590.c b/drivers/s390/char/tape_3590.c index fbe361fcd2c0..de2e99e0a71b 100644 --- a/drivers/s390/char/tape_3590.c +++ b/drivers/s390/char/tape_3590.c @@ -329,17 +329,17 @@ out: /* * Enable encryption */ -static int tape_3592_enable_crypt(struct tape_device *device) +static struct tape_request *__tape_3592_enable_crypt(struct tape_device *device) { struct tape_request *request; char *data; DBF_EVENT(6, "tape_3592_enable_crypt\n"); if (!crypt_supported(device)) - return -ENOSYS; + return ERR_PTR(-ENOSYS); request = tape_alloc_request(2, 72); if (IS_ERR(request)) - return PTR_ERR(request); + return request; data = request->cpdata; memset(data,0,72); @@ -354,23 +354,42 @@ static int tape_3592_enable_crypt(struct tape_device *device) request->op = TO_CRYPT_ON; tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data); tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36); + return request; +} + +static int tape_3592_enable_crypt(struct tape_device *device) +{ + struct tape_request *request; + + request = __tape_3592_enable_crypt(device); + if (IS_ERR(request)) + return PTR_ERR(request); return tape_do_io_free(device, request); } +static void tape_3592_enable_crypt_async(struct tape_device *device) +{ + struct tape_request *request; + + request = __tape_3592_enable_crypt(device); + if (!IS_ERR(request)) + tape_do_io_async_free(device, request); +} + /* * Disable encryption */ -static int tape_3592_disable_crypt(struct tape_device *device) +static struct tape_request *__tape_3592_disable_crypt(struct tape_device *device) { struct tape_request *request; char *data; DBF_EVENT(6, "tape_3592_disable_crypt\n"); if (!crypt_supported(device)) - return -ENOSYS; + return ERR_PTR(-ENOSYS); request = tape_alloc_request(2, 72); if (IS_ERR(request)) - return PTR_ERR(request); + return request; data = request->cpdata; memset(data,0,72); @@ -383,9 +402,28 @@ static int tape_3592_disable_crypt(struct tape_device *device) tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data); tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36); + return request; +} + +static int tape_3592_disable_crypt(struct tape_device *device) +{ + struct tape_request *request; + + request = __tape_3592_disable_crypt(device); + if (IS_ERR(request)) + return PTR_ERR(request); return tape_do_io_free(device, request); } +static void tape_3592_disable_crypt_async(struct tape_device *device) +{ + struct tape_request *request; + + request = __tape_3592_disable_crypt(device); + if (!IS_ERR(request)) + tape_do_io_async_free(device, request); +} + /* * IOCTL: Set encryption status */ @@ -457,8 +495,7 @@ tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg) /* * SENSE Medium: Get Sense data about medium state */ -static int -tape_3590_sense_medium(struct tape_device *device) +static int tape_3590_sense_medium(struct tape_device *device) { struct tape_request *request; @@ -470,6 +507,18 @@ tape_3590_sense_medium(struct tape_device *device) return tape_do_io_free(device, request); } +static void tape_3590_sense_medium_async(struct tape_device *device) +{ + struct tape_request *request; + + request = tape_alloc_request(1, 128); + if (IS_ERR(request)) + return; + request->op = TO_MSEN; + tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata); + tape_do_io_async_free(device, request); +} + /* * MTTELL: Tell block. Return the number of block relative to current file. */ @@ -546,15 +595,14 @@ tape_3590_read_opposite(struct tape_device *device, * 2. The attention msg is written to the "read subsystem data" buffer. * In this case we probably should print it to the console. */ -static int -tape_3590_read_attmsg(struct tape_device *device) +static void tape_3590_read_attmsg_async(struct tape_device *device) { struct tape_request *request; char *buf; request = tape_alloc_request(3, 4096); if (IS_ERR(request)) - return PTR_ERR(request); + return; request->op = TO_READ_ATTMSG; buf = request->cpdata; buf[0] = PREP_RD_SS_DATA; @@ -562,12 +610,15 @@ tape_3590_read_attmsg(struct tape_device *device) tape_ccw_cc(request->cpaddr, PERFORM_SS_FUNC, 12, buf); tape_ccw_cc(request->cpaddr + 1, READ_SS_DATA, 4096 - 12, buf + 12); tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); - return tape_do_io_free(device, request); + tape_do_io_async_free(device, request); } /* * These functions are used to schedule follow-up actions from within an * interrupt context (like unsolicited interrupts). + * Note: the work handler is called by the system work queue. The tape + * commands started by the handler need to be asynchrounous, otherwise + * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq). */ struct work_handler_data { struct tape_device *device; @@ -583,16 +634,16 @@ tape_3590_work_handler(struct work_struct *work) switch (p->op) { case TO_MSEN: - tape_3590_sense_medium(p->device); + tape_3590_sense_medium_async(p->device); break; case TO_READ_ATTMSG: - tape_3590_read_attmsg(p->device); + tape_3590_read_attmsg_async(p->device); break; case TO_CRYPT_ON: - tape_3592_enable_crypt(p->device); + tape_3592_enable_crypt_async(p->device); break; case TO_CRYPT_OFF: - tape_3592_disable_crypt(p->device); + tape_3592_disable_crypt_async(p->device); break; default: DBF_EVENT(3, "T3590: work handler undefined for " |