[PATCH v2] nvme-fabrics: check max outstanding commands

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

Maxcmd is mandatory for fabrics, check it early to identify the root
cause instead of waiting for it to propagate to "sqsize" and "allocing
queue".

By the way, change nvme_check_ctrl_fabric_info() to
nvmf_validate_identify_ctrl().

Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
---
Changes from v1 to v2:
- Revert nvme_check_ctrl_fabric_info() function name change.

 drivers/nvme/host/core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0a96362912ce..7c247b849bbb 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3117,6 +3117,11 @@ static int nvme_check_ctrl_fabric_info(struct nvme_ctrl *ctrl, struct nvme_id_ct
 		return -EINVAL;
 	}
 
+	if (!ctrl->maxcmd) {
+		dev_err(ctrl->device, "Maximum outstanding commands is 0\n");
+		return -EINVAL;
+	}
+
 	return 0;
 }
 
-- 
2.43.0