[PATCH v2] nvme: check at least one ns identification reported

[Guixin Liu <kanie@linux.alibaba.com>]

Per the NVMe spec after 1.3:
  At least one Namespace Identification Descriptor identifying the
  namespace (i.e., NIDT field set to 1h, 2h, or 3h).
Check there is at least one reported.

Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
---
Changes from v1 to v2:
- Check only when the nvme version is greater than or
equal to 1.3.

 drivers/nvme/host/core.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 84cb859a911d..cf767ac697dc 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1426,7 +1426,7 @@ static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
 }
 
 static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
-		struct nvme_ns_id_desc *cur, bool *csi_seen)
+		struct nvme_ns_id_desc *cur, bool *csi_seen, bool *has_id)
 {
 	const char *warn_str = "ctrl returned bogus length:";
 	void *data = cur;
@@ -1438,6 +1438,7 @@ static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
 				 warn_str, cur->nidl);
 			return -1;
 		}
+		*has_id = true;
 		if (ctrl->quirks & NVME_QUIRK_BOGUS_NID)
 			return NVME_NIDT_EUI64_LEN;
 		memcpy(ids->eui64, data + sizeof(*cur), NVME_NIDT_EUI64_LEN);
@@ -1448,6 +1449,7 @@ static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
 				 warn_str, cur->nidl);
 			return -1;
 		}
+		*has_id = true;
 		if (ctrl->quirks & NVME_QUIRK_BOGUS_NID)
 			return NVME_NIDT_NGUID_LEN;
 		memcpy(ids->nguid, data + sizeof(*cur), NVME_NIDT_NGUID_LEN);
@@ -1458,6 +1460,7 @@ static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
 				 warn_str, cur->nidl);
 			return -1;
 		}
+		*has_id = true;
 		if (ctrl->quirks & NVME_QUIRK_BOGUS_NID)
 			return NVME_NIDT_UUID_LEN;
 		uuid_copy(&ids->uuid, data + sizeof(*cur));
@@ -1482,6 +1485,7 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl,
 {
 	struct nvme_command c = { };
 	bool csi_seen = false;
+	bool has_id = false;
 	int status, pos, len;
 	void *data;
 
@@ -1513,13 +1517,25 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl,
 		if (cur->nidl == 0)
 			break;
 
-		len = nvme_process_ns_desc(ctrl, &info->ids, cur, &csi_seen);
+		len = nvme_process_ns_desc(ctrl, &info->ids, cur,
+					   &csi_seen, &has_id);
 		if (len < 0)
 			break;
 
 		len += sizeof(*cur);
 	}
 
+	/*
+	 * NVMe 1.3 spec introduced ns identification, a controller should
+	 * return at least one.
+	 */
+	if (!has_id && ctrl->vs >= NVME_VS(1, 3, 0)) {
+		dev_warn(ctrl->device,
+			 "No identification reported for nsid:%d\n",
+			 info->nsid);
+		status = -EINVAL;
+	}
+
 	if (nvme_multi_css(ctrl) && !csi_seen) {
 		dev_warn(ctrl->device, "Command set not reported for nsid:%d\n",
 			 info->nsid);
-- 
2.43.0