[PATCH] 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>
---
 drivers/nvme/host/core.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0a96362912ce..5cdd22f591f9 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3084,7 +3084,8 @@ static int nvme_init_effects(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
 	return 0;
 }
 
-static int nvme_check_ctrl_fabric_info(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
+static int nvmf_validate_identify_ctrl(struct nvme_ctrl *ctrl,
+				       struct nvme_id_ctrl *id)
 {
 	/*
 	 * In fabrics we need to verify the cntlid matches the
@@ -3117,6 +3118,11 @@ 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;
 }
 
@@ -3232,7 +3238,7 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl)
 		ctrl->iorcsz = le32_to_cpu(id->iorcsz);
 		ctrl->maxcmd = le16_to_cpu(id->maxcmd);
 
-		ret = nvme_check_ctrl_fabric_info(ctrl, id);
+		ret = nvmf_validate_identify_ctrl(ctrl, id);
 		if (ret)
 			goto out_free;
 	} else {
-- 
2.43.0