nvme-core: check ctrl css before setting up zns

Ensure multiple Command Sets are supported before starting to setup a
ZNS namespace.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
[hch: move the check around a bit]
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 63bb1da..82ad5ee 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4096,6 +4096,12 @@ static void nvme_validate_or_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
                                nsid);
                        break;
                }
+               if (!nvme_multi_css(ctrl)) {
+                       dev_warn(ctrl->device,
+                               "command set not reported for nsid: %d\n",
+                               ns->head->ns_id);
+                       break;
+               }
                nvme_alloc_ns(ctrl, nsid, &ids);
                break;
        default: