[PATCH 1/2] nvme: introduce nvme_check_ctrl_fabric_info helper

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

Inroduce nvme_check_ctrl_fabric_info helper to check
fabric ctroller info returned by target.

Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
---
 drivers/nvme/host/core.c | 42 ++++++++++++++++++++++++------------------
 1 file changed, 24 insertions(+), 18 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 1be1ce5..4da6ee6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3024,6 +3024,28 @@ 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)
+{
+	/*
+	 * In fabrics we need to verify the cntlid matches the
+	 * admin connect
+	 */
+	if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
+		dev_err(ctrl->device,
+			"Mismatching cntlid: Connect %u vs Identify %u, rejecting\n",
+			ctrl->cntlid, le16_to_cpu(id->cntlid));
+		return -EINVAL;
+	}
+
+	if (!nvme_discovery_ctrl(ctrl) && !ctrl->kas) {
+		dev_err(ctrl->device,
+			"keep-alive support is mandatory for fabrics\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int nvme_init_identify(struct nvme_ctrl *ctrl)
 {
 	struct nvme_id_ctrl *id;
@@ -3136,25 +3158,9 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl)
 		ctrl->iorcsz = le32_to_cpu(id->iorcsz);
 		ctrl->maxcmd = le16_to_cpu(id->maxcmd);
 
-		/*
-		 * In fabrics we need to verify the cntlid matches the
-		 * admin connect
-		 */
-		if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
-			dev_err(ctrl->device,
-				"Mismatching cntlid: Connect %u vs Identify "
-				"%u, rejecting\n",
-				ctrl->cntlid, le16_to_cpu(id->cntlid));
-			ret = -EINVAL;
-			goto out_free;
-		}
-
-		if (!nvme_discovery_ctrl(ctrl) && !ctrl->kas) {
-			dev_err(ctrl->device,
-				"keep-alive support is mandatory for fabrics\n");
-			ret = -EINVAL;
+		ret = nvme_check_ctrl_fabric_info(ctrl, id);
+		if (ret)
 			goto out_free;
-		}
 	} else {
 		ctrl->hmpre = le32_to_cpu(id->hmpre);
 		ctrl->hmmin = le32_to_cpu(id->hmmin);
-- 
1.8.3.1