nvme: add comment for unaligned "fake" nqn

Current "fake" nqn field is "nqn.2014.08.org.nvmexpress:", it is
not aligned with the canonical version for history reasons.

Signed-off-by: Linjun Bao <meljbao@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index af367b22871b1f71ae803165d3978d1f87f1f800..1128816646958a51ec331825b92b4b21ca5f1989 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2704,7 +2704,11 @@ static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ct
                        dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
        }
 
-       /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
+       /*
+        * Generate a "fake" NQN similar to the one in Section 4.5 of the NVMe
+        * Base Specification 2.0.  It is slightly different from the format
+        * specified there due to historic reasons, and we can't change it now.
+        */
        off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
                        "nqn.2014.08.org.nvmexpress:%04x%04x",
                        le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));