blkcg: fix edge case for blk_get_rl() under memory pressure
authorDennis Zhou <dennis@kernel.org>
Sat, 20 Oct 2018 18:56:11 +0000 (14:56 -0400)
committerJens Axboe <axboe@kernel.dk>
Sat, 20 Oct 2018 21:39:54 +0000 (15:39 -0600)
commitb2c3fa546705944e748666b474ffdaebaec0569f
treee55b5f8cb1fd71a8a72013b3bff8147de415b979
parentbbc152825afc869ed6e0b58fdc5e3e477a6c15d5
blkcg: fix edge case for blk_get_rl() under memory pressure

It is possible for blkg creation to fail when in blk_get_rl(). In this
situation, the fallback logic returns the nearest created blkg. There is
however special handling for the request_list for the root blkcg. This
fixes the missing edge case from the earlier series changing
blk_get_rl().

Fixes: e2b0989954ae ("blkcg: cleanup and make blk_get_rl use blkg_lookup_create")
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
include/linux/blk-cgroup.h