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author | Ming Lei <ming.lei@redhat.com> | 2023-07-11 17:40:41 +0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-16 18:27:30 +0200 |
commit | c21fddce7e450b737a77cd918e55969076143bb0 (patch) | |
tree | e2cd5a86ba110816822bb03d3abee5cc5af56e6f /drivers | |
parent | cddbaa8dee7e7d4eb678e6f04fec1aa43117c7f4 (diff) | |
download | linux-c21fddce7e450b737a77cd918e55969076143bb0.tar.gz |
nvme-rdma: fix potential unbalanced freeze & unfreeze
commit 29b434d1e49252b3ad56ad3197e47fafff5356a1 upstream. Move start_freeze into nvme_rdma_configure_io_queues(), and there is at least two benefits: 1) fix unbalanced freeze and unfreeze, since re-connection work may fail or be broken by removal 2) IO during error recovery can be failfast quickly because nvme fabrics unquiesces queues after teardown. One side-effect is that !mpath request may timeout during connecting because of queue topo change, but that looks not one big deal: 1) same problem exists with current code base 2) compared with !mpath, mpath use case is dominant Fixes: 9f98772ba307 ("nvme-rdma: fix controller reset hang during traffic") Cc: stable@vger.kernel.org Signed-off-by: Ming Lei <ming.lei@redhat.com> Tested-by: Yi Zhang <yi.zhang@redhat.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/nvme/host/rdma.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 80383213b882..c478480f54aa 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -923,6 +923,7 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new) goto out_cleanup_tagset; if (!new) { + nvme_start_freeze(&ctrl->ctrl); nvme_start_queues(&ctrl->ctrl); if (!nvme_wait_freeze_timeout(&ctrl->ctrl, NVME_IO_TIMEOUT)) { /* @@ -931,6 +932,7 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new) * to be safe. */ ret = -ENODEV; + nvme_unfreeze(&ctrl->ctrl); goto out_wait_freeze_timed_out; } blk_mq_update_nr_hw_queues(ctrl->ctrl.tagset, @@ -980,7 +982,6 @@ static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl, bool remove) { if (ctrl->ctrl.queue_count > 1) { - nvme_start_freeze(&ctrl->ctrl); nvme_stop_queues(&ctrl->ctrl); nvme_sync_io_queues(&ctrl->ctrl); nvme_rdma_stop_io_queues(ctrl); |