[PATCH 2/2] nvme: Print warning for list-ns command failure

[Minwoo Im]

During the scan_work, list-ns command is issued to figure out which
namespaces are in active state.  But if this command is failed, it will
try to scan namespaces sequentially.  In this situation, we don't see
any warnings and don't even know whether list-ns command has been failed
or not easiliy.

This patch prints out warning for the failure of the list-ns command.
Then we can find easily what's going on in the scan_work like:

[    1.108399] nvme nvme0: Identify NS List failed (status=0x400b)
[    1.109583] nvme0n1: detected capacity change from 0 to 1048576
[    1.112186] nvme nvme0: Identify Descriptors failed (nsid=2, status=0x4002)
[    1.113929] nvme nvme0: Identify Descriptors failed (nsid=3, status=0x4002)
[    1.116537] nvme nvme0: Identify Descriptors failed (nsid=4, status=0x4002)
...

Signed-off-by: Minwoo Im <minwoo.im.dev at gmail.com>
---
 drivers/nvme/host/core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ded6376facbe..64905bc83e9d 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4096,8 +4096,12 @@ static int nvme_scan_ns_list(struct nvme_ctrl *ctrl)
 
 		ret = nvme_submit_sync_cmd(ctrl->admin_q, &cmd, ns_list,
 					    NVME_IDENTIFY_DATA_SIZE);
-		if (ret)
+		if (ret) {
+			dev_warn(ctrl->device,
+				"Identify NS List failed (status=0x%x)\n",
+				ret);
 			goto free;
+		}
 
 		for (i = 0; i < nr_entries; i++) {
 			u32 nsid = le32_to_cpu(ns_list[i]);
-- 
2.17.1