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OpenCloudOS-Kernel
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Jens Axboe 62c1fe9d9f cfq-iosched: fix race between exiting queue and exiting task 
Original patch from Nikanth Karthikesan <knikanth@suse.de>

When a queue exits the queue lock is taken and cfq_exit_queue() would free all
the cic's associated with the queue.

But when a task exits, cfq_exit_io_context() gets cic one by one and then
locks the associated queue to call __cfq_exit_single_io_context. It looks like
between getting a cic from the ioc and locking the queue, the queue might have
exited on another cpu.

Fix this by rechecking the cfq_io_context queue key inside the queue lock
again, and not calling into __cfq_exit_single_io_context() if somebody
beat us to it.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
 		2008-12-29 08:29:52 +01:00
..
Kconfig Get rid of CONFIG_LSF 2008-12-29 08:29:51 +01:00
Kconfig.iosched update I/O sched Kconfig help texts - CFQ is now default, not AS. 2007-02-17 20:08:22 +01:00
Makefile block: unify request timeout handling 2008-10-09 08:56:13 +02:00
as-iosched.c block: get rid of elevator_t typedef 2008-12-29 08:29:50 +01:00
blk-barrier.c block: fix empty barrier on write-through w/ ordered tag 2008-12-29 08:28:45 +01:00
blk-core.c block: don't use plugging on SSD devices 2008-12-29 08:28:45 +01:00
blk-exec.c Add some block/ source files to the kernel-api docbook. Fix kernel-doc notation in them as needed. Fix changed function parameter names. Fix typos/spellos. In comments, change REQ_SPECIAL to REQ_TYPE_SPECIAL and REQ_BLOCK_PC to REQ_TYPE_BLOCK_PC. 2008-10-09 08:56:03 +02:00
blk-integrity.c block: Switch blk_integrity_compare from bdev to gendisk 2008-10-09 08:56:21 +02:00
blk-ioc.c cfq-iosched: fix RCU race in the cfq io_context destructor handling 2008-05-07 09:28:57 +02:00
blk-map.c When block layer fails to map iov, it calls bio_unmap_user to undo 2008-12-03 12:41:20 +01:00
blk-merge.c block: remove unused ll_new_mergeable() 2008-11-06 08:41:55 +01:00
blk-settings.c block: use min_not_zero in blk_queue_stack_limits 2008-12-29 08:29:51 +01:00
blk-softirq.c block: make blk_softirq_init() static 2008-12-29 08:29:51 +01:00
blk-sysfs.c block: don't take lock on changing ra_pages 2008-12-29 08:28:43 +01:00
blk-tag.c block/blk-tag.c: cleanup kernel-doc 2008-12-29 08:28:43 +01:00
blk-timeout.c block: leave the request timeout timer running even on an empty list 2008-12-29 08:28:42 +01:00
blk.h block: remove __generic_unplug_device() from exports 2008-10-17 14:03:08 +02:00
blktrace.c blktrace: port to tracepoints 2008-11-26 12:13:34 +01:00
bsg.c Enforce a minimum SG_IO timeout 2008-12-05 14:49:18 -08:00
cfq-iosched.c cfq-iosched: fix race between exiting queue and exiting task 2008-12-29 08:29:52 +01:00
cmd-filter.c [PATCH] introduce fmode_t, do annotations 2008-10-21 07:47:06 -04:00
compat_ioctl.c block: don't take lock on changing ra_pages 2008-12-29 08:28:43 +01:00
deadline-iosched.c block: get rid of elevator_t typedef 2008-12-29 08:29:50 +01:00
elevator.c block: get rid of elevator_t typedef 2008-12-29 08:29:50 +01:00
genhd.c block: add one-hit cache for disk partition lookup 2008-12-29 08:29:51 +01:00
ioctl.c block: don't take lock on changing ra_pages 2008-12-29 08:28:43 +01:00
noop-iosched.c block: get rid of elevator_t typedef 2008-12-29 08:29:50 +01:00
scsi_ioctl.c scsi-ioctl: use clock_t <> jiffies 2008-12-29 08:28:42 +01:00