quoted

quoted

And what if it is a DNR error? For example, the controller simply
doesn't support this CNS value. While the controller should support it,
we definitely don't need it for NVM command set namespaces.

Maybe I mis-undersatnd the comment, but if you see a DNR error, it means
that the controller replied an error and its final, so then you can have
extra checks.

If the controller does not support the CNS value, it may return Invalid
Field with DNR set. That error currently gets propogated back to
nvme_init_ns_head(), which then abandons the namespace. Just as the code
coments say, we had been historically been clearing such errors because
we have other ways to identify the namespace, but now we're not clearing
that error.

I don't understand what you are saying Keith.

My comment was for this block:
--
	if (!status && nvme_multi_css(ctrl) && !csi_seen) {
		dev_warn(ctrl->device, "Command set not reported for nsid:%d\n",
			 nsid);
		status = -EINVAL;
	}
--

I was saying that !status doesn't necessarily mean success, but it can
also mean that its an retry-able error status (due to transport or
controller). If we see a retry-able error we should still clear the
status so we don't abandon the namespace.

This for example would achieve that:
--

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ba512c45b40f..46d8a8379aff 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c

@@ -1126,12 +1126,21 @@ static int nvme_identify_ns_descs(struct 

nvme_ctrl *ctrl, unsigned nsid,
         if (status) {
                 dev_warn(ctrl->device,
                         "Identify Descriptors failed (%d)\n", status);
-                /*
-                 * Don't treat an error as fatal, as we potentially already
-                 * have a NGUID or EUI-64.
-                 */
-               if (status > 0 && !(status & NVME_SC_DNR))
-                       status = 0;
+
+               if (status > 0 && !(status & NVME_SC_DNR)) {
+                       if (nvme_multi_css(ctrl) && !csi_seen) {
+                               dev_warn(ctrl->device,
+                                       "Command set not reported for 
nsid:%d\n",
+                                       nsid);
+                               status = -EINVAL;
+                       } else {
+                               /*
+                                * Don't treat an error as fatal, as we
+                                * potentially already have a NGUID or 
EUI-64.
+                                */
+                               status = 0;
+                       }
+               }
                 goto free_data;
         }
--