Commit 0067d4b0 authored Mar 13, 2017 by Sagi Grimberg Committed by Jens Axboe Mar 13, 2017

blk-mq: Fix tagset reinit in the presence of cpu hot-unplug



In case cpu was unplugged, we need to make sure not to assume
that the tags for that cpu are still allocated. so check
for null tags when reinitializing a tagset.

Reported-by: Yi Zhang <yizhan@redhat.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent f5fe1b51

block/blk-mq-tag.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -295,6 +295,9 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set)
		for (i = 0; i < set->nr_hw_queues; i++) {
		struct blk_mq_tags *tags = set->tags[i];

		if (!tags)
		continue;

		for (j = 0; j < tags->nr_tags; j++) {
		if (!tags->static_rqs[j])
		continue;

Admin message