[PATCH] watchdog: core: check hwdev before use it

[Andreas Schmidt]

Avoid null pointer access, if hwdev was not
set before call watchdog_register.

Signed-off-by: Andreas Schmidt <mail at schmidt-andreas.de>
---
 drivers/watchdog/wd_core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/wd_core.c b/drivers/watchdog/wd_core.c
index d3305443d..56e8626cb 100644
--- a/drivers/watchdog/wd_core.c
+++ b/drivers/watchdog/wd_core.c
@@ -112,10 +112,12 @@ static int watchdog_register_dev(struct watchdog *wd, const char *name, int id)
 int watchdog_register(struct watchdog *wd)
 {
 	struct param_d *p;
-	const char *alias;
+	const char *alias = NULL;
 	int ret = 0;
 
-	alias = of_alias_get(wd->hwdev->device_node);
+	if (wd->hwdev)
+		alias = of_alias_get(wd->hwdev->device_node);
+
 	if (alias)
 		ret = watchdog_register_dev(wd, alias, DEVICE_ID_SINGLE);
 
-- 
2.14.1