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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
6lowpan.c -rw-r--r-- 33.9 KB
6lowpan.h -rw-r--r-- 7.9 KB
Kconfig -rw-r--r-- 702 bytes
Makefile -rw-r--r-- 214 bytes
af802154.h -rw-r--r-- 1.2 KB
af_ieee802154.c -rw-r--r-- 8.6 KB
dgram.c -rw-r--r-- 9.4 KB
ieee802154.h -rw-r--r-- 1.6 KB
netlink.c -rw-r--r-- 3.0 KB
nl-mac.c -rw-r--r-- 16.3 KB
nl-phy.c -rw-r--r-- 8.5 KB
nl_policy.c -rw-r--r-- 2.2 KB
raw.c -rw-r--r-- 5.5 KB
wpan-class.c -rw-r--r-- 5.1 KB
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