5.4-stable review patch. If anyone has any objections, please let me know.
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From: Daniel Wagner wagi@kernel.org
[ Upstream commit 294b2b7516fd06a8dd82e4a6118f318ec521e706 ]
When the set feature attempts fails with any NVME status code set in nvme_set_queue_count, the function still report success. Though the numbers of queues set to 0. This is done to support controllers in degraded state (the admin queue is still up and running but no IO queues).
Though there is an exception. When nvme_set_features reports an host path error, nvme_set_queue_count should propagate this error as the connectivity is lost, which means also the admin queue is not working anymore.
Fixes: 9a0be7abb62f ("nvme: refactor set_queue_count") Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Hannes Reinecke hare@suse.de Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Daniel Wagner wagi@kernel.org Signed-off-by: Keith Busch kbusch@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/core.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index a841fd4929adc..dd4b99ea956ac 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1251,7 +1251,13 @@ int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0, &result); - if (status < 0) + + /* + * It's either a kernel error or the host observed a connection + * lost. In either case it's not possible communicate with the + * controller and thus enter the error code path. + */ + if (status < 0 || status == NVME_SC_HOST_PATH_ERROR) return status;
/*