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authorSagi Grimberg <sagi@grimberg.me>2017-03-13 16:10:11 +0200
committerJens Axboe <axboe@fb.com>2017-03-13 08:14:23 -0600
commit0067d4b020ea07a58540acb2c5fcd3364bf326e0 (patch)
tree9e2e1375e8db4eb35eb7419b33c5f8cde51afefc
parentf5fe1b51905df7cfe4fdfd85c5fb7bc5b71a094f (diff)
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>
-rw-r--r--block/blk-mq-tag.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index e48bc2c72615..9d97bfc4d465 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -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;