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block: blk_add_rq_to_plug(): clear stale 'last' after flush

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blk_mq_flush_plug_list() empties ->mq_list and request we'd peeked there
before that call is gone; in any case, we are not dealing with a mix
of requests for different queues now - there's no requests left in the
plug.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Al Viro 2022-11-01 00:54:13 +00:00 committed by Jens Axboe
parent 943f45b939
commit 878eb6e48f
1 changed files with 1 additions and 0 deletions
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block/blk-mq.c
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@ -1262,6 +1262,7 @@ static void blk_add_rq_to_plug(struct blk_plug *plug, struct request *rq)
(!blk_queue_nomerges(rq->q) && (!blk_queue_nomerges(rq->q) &&
blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE)) { blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE)) {
blk_mq_flush_plug_list(plug, false); blk_mq_flush_plug_list(plug, false);
last = NULL;
trace_block_plug(rq->q); trace_block_plug(rq->q);
} }