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13 June 2022, 11:31:42 UTC
Revision a8c32a5c98943d370ea606a2e7dc04717eb92206 authored by Jens Axboe on 06 November 2012, 11:24:26 UTC, committed by Jens Axboe on 23 November 2012, 13:32:54 UTC 
dm: fix deadlock with request based dm and queue request_fn recursion
 
Request based dm attempts to re-run the request queue off the
request completion path. If used with a driver that potentially does
end_io from its request_fn, we could deadlock trying to recurse
back into request dispatch. Fix this by punting the request queue
run to kblockd.

Tested to fix a quickly reproducible deadlock in such a scenario.

Cc: stable@kernel.org
Acked-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent eac7cc5
Raw File
Tip revision: a8c32a5c98943d370ea606a2e7dc04717eb92206 authored by Jens Axboe on 06 November 2012, 11:24:26 UTC
dm: fix deadlock with request based dm and queue request_fn recursion
Tip revision: a8c32a5
Makefile 
#
# Makefile for the kernel block layer
#

obj-$(CONFIG_BLOCK) := elevator.o blk-core.o blk-tag.o blk-sysfs.o \
			blk-flush.o blk-settings.o blk-ioc.o blk-map.o \
			blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
			blk-iopoll.o blk-lib.o ioctl.o genhd.o scsi_ioctl.o \
			partition-generic.o partitions/

obj-$(CONFIG_BLK_DEV_BSG)	+= bsg.o
obj-$(CONFIG_BLK_DEV_BSGLIB)	+= bsg-lib.o
obj-$(CONFIG_BLK_CGROUP)	+= blk-cgroup.o
obj-$(CONFIG_BLK_DEV_THROTTLING)	+= blk-throttle.o
obj-$(CONFIG_IOSCHED_NOOP)	+= noop-iosched.o
obj-$(CONFIG_IOSCHED_DEADLINE)	+= deadline-iosched.o
obj-$(CONFIG_IOSCHED_CFQ)	+= cfq-iosched.o

obj-$(CONFIG_BLOCK_COMPAT)	+= compat_ioctl.o
obj-$(CONFIG_BLK_DEV_INTEGRITY)	+= blk-integrity.o
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