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| author |   Ming Lei <ming.lei@redhat.com> | 2022-06-16 09:44:00 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2022-06-16 14:45:15 -0600 |
| commit | 4d337cebcb1c27d9b48c48b9a98e939d4552d584 (patch) | |
| tree | 145de66b189943b28e6b089d4345459a7d22d2c6 /block/bfq-iosched.c | |
| parent | blk-mq: protect q->elevator by ->sysfs_lock in blk_mq_elv_switch_none (diff) | |
| download | linux-dev-4d337cebcb1c27d9b48c48b9a98e939d4552d584.tar.xz linux-dev-4d337cebcb1c27d9b48c48b9a98e939d4552d584.zip | |
blk-mq: avoid to touch q->elevator without any protection
q->elevator is referred in blk_mq_has_sqsched() without any protection,
no .q_usage_counter is held, no queue srcu and rcu read lock is held,
so potential use-after-free may be triggered.
Fix the issue by adding one queue flag for checking if the elevator
uses single queue style dispatch. Meantime the elevator feature flag
of ELEVATOR_F_MQ_AWARE isn't needed any more.
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220616014401.817001-3-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bfq-iosched.c')
| -rw-r--r-- | block/bfq-iosched.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 0d46cb728bbf..caa55a5624bc 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -7188,6 +7188,9 @@ static int bfq_init_queue(struct request_queue *q, struct elevator_type *e) bfq_init_root_group(bfqd->root_group, bfqd); bfq_init_entity(&bfqd->oom_bfqq.entity, bfqd->root_group); + /* We dispatch from request queue wide instead of hw queue */ + blk_queue_flag_set(QUEUE_FLAG_SQ_SCHED, q); + wbt_disable_default(q); return 0; |