diff mbox series

[-next,v3,2/2] watchdog: Clean up error handlings

Message ID 20201105123848.93735-2-wangwensheng4@huawei.com
State New
Headers show
Series [-next,v3,1/2] watchdog: Fix potential dereferencing of null pointer | expand

Commit Message

Wang Wensheng Nov. 5, 2020, 12:38 p.m. UTC 
Clean up the repeated error handling process in function
__watchdog_register_device().

Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>
---
 drivers/watchdog/watchdog_core.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 945ab38b14b8..4fa54a620ccd 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -252,10 +252,8 @@  static int __watchdog_register_device(struct watchdog_device *wdd)
 		wdd->id = id;
 
 		ret = watchdog_dev_register(wdd);
-		if (ret) {
-			ida_simple_remove(&watchdog_ida, id);
-			return ret;
-		}
+		if (ret)
+			goto id_remove;
 	}
 
 	/* Module parameter to force watchdog policy on reboot. */
@@ -270,9 +268,8 @@  static int __watchdog_register_device(struct watchdog_device *wdd)
 		if (!wdd->ops->stop) {
 			pr_err("watchdog%d: Cannot support stop_on_reboot\n",
 				wdd->id);
-			watchdog_dev_unregister(wdd);
-			ida_simple_remove(&watchdog_ida, id);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto dev_unregister;
 		}
 
 		wdd->reboot_nb.notifier_call = watchdog_reboot_notifier;
@@ -280,9 +277,7 @@  static int __watchdog_register_device(struct watchdog_device *wdd)
 		if (ret) {
 			pr_err("watchdog%d: Cannot register reboot notifier (%d)\n",
 			       wdd->id, ret);
-			watchdog_dev_unregister(wdd);
-			ida_simple_remove(&watchdog_ida, id);
-			return ret;
+			goto dev_unregister;
 		}
 	}
 
@@ -296,6 +291,13 @@  static int __watchdog_register_device(struct watchdog_device *wdd)
 	}
 
 	return 0;
+
+dev_unregister:
+	watchdog_dev_unregister(wdd);
+id_remove:
+	ida_simple_remove(&watchdog_ida, id);
+
+	return ret;
 }
 
 /**