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| author |   Balbir Singh <sblbir@amzn.com> | 2019-09-18 00:27:20 +0000 |
|---|---|---|
| committer |   Sagi Grimberg <sagi@grimberg.me> | 2019-09-23 14:00:11 -0700 |
| commit | b224726de5e496dbf78147a66755c3d81e28bdd2 (patch) | |
| tree | 153d38703025fcb41bb35c348558fa028e312624 /drivers/nvme/host/core.c | |
| parent | nvmet: change ppl to lpp (diff) | |
| download | linux-dev-b224726de5e496dbf78147a66755c3d81e28bdd2.tar.xz linux-dev-b224726de5e496dbf78147a66755c3d81e28bdd2.zip | |
nvme-pci: Fix a race in controller removal
User space programs like udevd may try to read to partitions at the
same time the driver detects a namespace is unusable, and may deadlock
if revalidate_disk() is called while such a process is waiting to
enter the frozen queue. On detecting a dead namespace, move the disk
revalidate after unblocking dispatchers that may be holding bd_butex.
changelog Suggested-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Balbir Singh <sblbir@amzn.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Diffstat (limited to '')
| -rw-r--r-- | drivers/nvme/host/core.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 108f60b46804..0c385b1994fe 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -102,10 +102,13 @@ static void nvme_set_queue_dying(struct nvme_ns *ns) */ if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags)) return; - revalidate_disk(ns->disk); blk_set_queue_dying(ns->queue); /* Forcibly unquiesce queues to avoid blocking dispatch */ blk_mq_unquiesce_queue(ns->queue); + /* + * Revalidate after unblocking dispatchers that may be holding bd_butex + */ + revalidate_disk(ns->disk); } static void nvme_queue_scan(struct nvme_ctrl *ctrl) |