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nvme/core: Fix race kicking freed request_queue

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If a namespace has already been marked dead, we don't want to kick the
request_queue again since we may have just freed it from another thread.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2017-02-10 18:15:51 -05:00 committed by Jens Axboe
parent 6db28eda26
commit f33447b90e
1 changed files with 3 additions and 3 deletions
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4
drivers/nvme/host/core.c
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@ -2333,9 +2333,9 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl)
* Revalidating a dead namespace sets capacity to 0. This will
* end buffered writers dirtying pages that can't be synced.
*/
if (ns->disk && !test_and_set_bit(NVME_NS_DEAD, &ns->flags))
if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
continue;
revalidate_disk(ns->disk);
blk_set_queue_dying(ns->queue);
blk_mq_abort_requeue_list(ns->queue);
blk_mq_start_stopped_hw_queues(ns->queue, true);