[PATCH] phy: core: check whether ops callback function is assigned

[Jaehoon Chung]

If some ops-> callback function are not assigend, then it should do the
unexpect behavior.
To prevent the potential NULL pointer dereference, check the each
callback functions before doing operation.

Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
---
 drivers/phy/phy-core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index a268f4d6f3e9..e4eb4431c8a4 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -219,7 +219,7 @@ int phy_init(struct phy *phy)
 {
 	int ret;
 
-	if (!phy)
+	if (!phy || !phy->ops->init)
 		return 0;
 
 	ret = phy_pm_runtime_get_sync(phy);
@@ -248,7 +248,7 @@ int phy_exit(struct phy *phy)
 {
 	int ret;
 
-	if (!phy)
+	if (!phy || !phy->ops->exit)
 		return 0;
 
 	ret = phy_pm_runtime_get_sync(phy);
@@ -277,7 +277,7 @@ int phy_power_on(struct phy *phy)
 {
 	int ret = 0;
 
-	if (!phy)
+	if (!phy || !phy->ops->power_on)
 		goto out;
 
 	if (phy->pwr) {
@@ -319,7 +319,7 @@ int phy_power_off(struct phy *phy)
 {
 	int ret;
 
-	if (!phy)
+	if (!phy || !phy->ops->power_off)
 		return 0;
 
 	mutex_lock(&phy->mutex);
-- 
2.11.0