Sam Bradshaw bc188d818e blkmq: Fix NULL pointer deref when all reserved tags in ... When allocating from the reserved tags pool, bt_get() is called with a NULL hctx. If all tags are in use, the hw queue is kicked to push out any pending IO, potentially freeing tags, and tag allocation is retried. The problem is that blk_mq_run_hw_queue() doesn't check for a NULL hctx. So we avoid it with a simple NULL hctx test. Tested by hammering mtip32xx with concurrent smartctl/hdparm. Signed-off-by: Sam Bradshaw <sbradshaw@micron.com> Signed-off-by: Selvan Mani <smani@micron.com> Fixes: b32232073e ("blk-mq: fix hang in bt_get()") Cc: stable@kernel.org Added appropriate comment. Signed-off-by: Jens Axboe <axboe@fb.com>		2015-03-18 17:06:18 -06:00
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partitions	Merge branch 'for-3.20/core' of git://git.kernel.dk/linux-block	2015-02-12 14:13:23 -08:00
Kconfig	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00
Kconfig.iosched	blkcg: make CONFIG_BLK_CGROUP bool	2012-03-06 21:27:21 +01:00
Makefile	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00
bio-integrity.c	block: fix regression where bio_integrity_process uses wrong bio_vec iterator	2014-12-02 08:15:21 -07:00
bio.c	block: rewrite and split __bio_copy_iov()	2015-02-05 09:30:44 -07:00
blk-cgroup.c	blkcg: remove blkcg->id	2014-09-08 09:55:37 -06:00
blk-cgroup.h	blkcg: remove blkcg->id	2014-09-08 09:55:37 -06:00
blk-core.c	Merge branch 'for-3.20/core' of git://git.kernel.dk/linux-block	2015-02-12 14:13:23 -08:00
blk-exec.c	blk-mq: avoid infinite recursion with the FUA flag	2014-09-22 11:55:19 -06:00
blk-flush.c	blk-mq: support per-distpatch_queue flush machinery	2014-09-25 15:22:45 -06:00
blk-integrity.c	block: Don't merge requests if integrity flags differ	2014-09-27 09:14:57 -06:00
blk-ioc.c	block: Substitute rcu_access_pointer() for rcu_dereference_raw()	2014-02-18 12:21:26 -08:00
blk-iopoll.c	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next	2014-06-03 12:57:53 -07:00
blk-lib.c	block: Quiesce zeroout wrapper	2015-02-05 10:14:54 -07:00
blk-map.c	block: handle the null_mapped flag correctly in blk_rq_map_user_iov	2015-02-11 11:24:12 -07:00
blk-merge.c	block: remove unused function blk_bio_map_sg	2015-02-11 11:24:14 -07:00
blk-mq-cpu.c	blk-mq: add file comments and update copyright notices	2014-05-28 10:15:41 -06:00
blk-mq-cpumap.c	blk-mq: Use all available hardware queues	2014-12-09 09:08:21 -07:00
blk-mq-sysfs.c	Revert "blk-mq: fix hctx/ctx kobject use-after-free"	2015-01-29 08:30:49 -08:00
blk-mq-tag.c	blkmq: Fix NULL pointer deref when all reserved tags in	2015-03-18 17:06:18 -06:00
blk-mq-tag.h	blk-mq: add tag allocation policy	2015-01-23 14:18:00 -07:00
blk-mq.c	blk-mq: fix use of incorrect goto label in blk_mq_init_queue error path	2015-03-13 08:22:32 -06:00
blk-mq.h	blk-mq: release mq's kobjects in blk_release_queue()	2015-01-29 08:30:51 -08:00
blk-settings.c	block: remove artifical max_hw_sectors cap	2014-10-21 14:02:54 -06:00
blk-softirq.c	block: fix regression with block enabled tagging	2014-04-09 21:54:06 -06:00
blk-sysfs.c	blk-mq: release mq's kobjects in blk_release_queue()	2015-01-29 08:30:51 -08:00
blk-tag.c	block: support different tag allocation policy	2015-01-23 14:15:46 -07:00
blk-throttle.c	blk-throttle: check stats_cpu before reading it from sysfs	2015-02-20 22:11:58 -08:00
blk-timeout.c	blk-mq: Allow requests to never expire	2015-01-08 08:59:01 -07:00
blk.h	blk-mq: support per-distpatch_queue flush machinery	2014-09-25 15:22:45 -06:00
bounce.c	mm: convert some level-less printks to pr_*	2014-06-06 16:08:18 -07:00
bsg-lib.c	bsg: Remove unused function bsg_goose_queue()	2012-12-06 14:33:02 +01:00
bsg.c	block: Simplify bsg complete all	2015-02-04 09:57:52 -07:00
cfq-iosched.c	cfq-iosched: handle failure of cfq group allocation	2015-02-09 10:22:39 -07:00
cmdline-parser.c	block: remove unrelated header files and export symbol	2014-01-21 20:18:26 -08:00
compat_ioctl.c	block, bdi: an active gendisk always has a request_queue associated with it	2014-09-08 10:00:35 -06:00
deadline-iosched.c	block: Stop abusing csd.list for fifo_time	2014-02-24 14:46:32 -08:00
elevator.c	block / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM	2014-12-04 01:00:23 +01:00
genhd.c	genhd: check for int overflow in disk_expand_part_tbl()	2014-11-19 13:09:07 -07:00
ioctl.c	block: Add discard flag to blkdev_issue_zeroout() function	2015-01-21 10:41:46 -07:00
ioprio.c	block: Fix computation of merged request priority	2014-10-31 08:30:43 -06:00
noop-iosched.c	elevator: Fix a race in elevator switching	2013-07-03 13:25:24 +02:00
partition-generic.c	block: Fix dev_t minor allocation lifetime	2014-09-03 15:01:02 -06:00
scsi_ioctl.c	block: pass iov_iter to the BLOCK_PC mapping functions	2015-02-05 09:30:40 -07:00
t10-pi.c	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00