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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
History
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
File Mode Size
Kconfig -rw-r--r-- 2.2 KB
Makefile -rw-r--r-- 279 bytes
af_can.c -rw-r--r-- 23.4 KB
af_can.h -rw-r--r-- 4.0 KB
bcm.c -rw-r--r-- 39.0 KB
gw.c -rw-r--r-- 22.9 KB
proc.c -rw-r--r-- 14.7 KB
raw.c -rw-r--r-- 18.7 KB
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