of: overlay: add entry to of_overlay_action_name[]

The values of enum of_overlay_notify_action are used to index into
array of_overlay_action_name.  Add an entry to of_overlay_action_name
for the value recently added to of_overlay_notify_action.

Array of_overlay_action_name[] is moved into include/linux/of.h
adjacent to enum of_overlay_notify_action to make the connection
between the two more obvious if either is modified in the future.

The only use of of_overlay_action_name is for error reporting in
overlay_notify().  All callers of overlay_notify() report the same
error, but with fewer details.  Remove the redundant error reports
in the callers.

Fixes: 067c098766 ("of: overlay: rework overlay apply and remove kfree()s")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220502181742.1402826-2-frowand.list@gmail.com

drivers/of/overlay.c

@@ -152,13 +152,6 @@ int of_overlay_notifier_unregister(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(of_overlay_notifier_unregister);
 
-static char *of_overlay_action_name[] = {
-	"pre-apply",
-	"post-apply",
-	"pre-remove",
-	"post-remove",
-};
-
 static int overlay_notify(struct overlay_changeset *ovcs,
 		enum of_overlay_notify_action action)
 {
@@ -178,7 +171,7 @@ static int overlay_notify(struct overlay_changeset *ovcs,
 		if (notifier_to_errno(ret)) {
 			ret = notifier_to_errno(ret);
 			pr_err("overlay changeset %s notifier error %d, target: %pOF\n",
-			       of_overlay_action_name[action], ret, nd.target);
+			       of_overlay_action_name(action), ret, nd.target);
 			return ret;
 		}
 	}
@@ -925,10 +918,8 @@ static int of_overlay_apply(struct overlay_changeset *ovcs)
 		goto out;
 
 	ret = overlay_notify(ovcs, OF_OVERLAY_PRE_APPLY);
-	if (ret) {
+	if (ret)
-		pr_err("overlay changeset pre-apply notify error %d\n", ret);
 		goto out;
-	}
 
 	ret = build_changeset(ovcs);
 	if (ret)
@@ -951,12 +942,9 @@ static int of_overlay_apply(struct overlay_changeset *ovcs)
 	/* notify failure is not fatal, continue */
 
 	ret_tmp = overlay_notify(ovcs, OF_OVERLAY_POST_APPLY);
-	if (ret_tmp) {
+	if (ret_tmp)
-		pr_err("overlay changeset post-apply notify error %d\n",
-		       ret_tmp);
 		if (!ret)
 			ret = ret_tmp;
-	}
 
 out:
 	pr_debug("%s() err=%d\n", __func__, ret);
@@ -1192,10 +1180,8 @@ int of_overlay_remove(int *ovcs_id)
 	}
 
 	ret = overlay_notify(ovcs, OF_OVERLAY_PRE_REMOVE);
-	if (ret) {
+	if (ret)
-		pr_err("overlay changeset pre-remove notify error %d\n", ret);
 		goto err_unlock;
-	}
 
 	ret_apply = 0;
 	ret = __of_changeset_revert_entries(&ovcs->cset, &ret_apply);
@@ -1218,12 +1204,9 @@ int of_overlay_remove(int *ovcs_id)
 	 * OF_OVERLAY_POST_REMOVE returns an error.
 	 */
 	ret_tmp = overlay_notify(ovcs, OF_OVERLAY_POST_REMOVE);
-	if (ret_tmp) {
+	if (ret_tmp)
-		pr_err("overlay changeset post-remove notify error %d\n",
-		       ret_tmp);
 		if (!ret)
 			ret = ret_tmp;
-	}
 
 	free_overlay_changeset(ovcs);
 

include/linux/of.h

@@ -1550,6 +1550,19 @@ enum of_overlay_notify_action {
 	OF_OVERLAY_POST_REMOVE,
 };
 
+static inline char *of_overlay_action_name(enum of_overlay_notify_action action)
+{
+	static char *of_overlay_action_name[] = {
+		"init",
+		"pre-apply",
+		"post-apply",
+		"pre-remove",
+		"post-remove",
+	};
+
+	return of_overlay_action_name[action];
+}
+
 struct of_overlay_notify_data {
 	struct device_node *overlay;
 	struct device_node *target;