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

..

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

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

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