phy: core: Get a refcount to phy in devm_of_phy_get_by_index()

On driver detach, devm_phy_release() will put a refcount to
the phy, so gets a refconut to it before return.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index fc48fac003a62ba124bd7c6820f24d5d040fcbf7..8c7f27db6ad352260f8ad8675758ed365b6390a6 100644 (file)
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -636,8 +636,9 @@ EXPORT_SYMBOL_GPL(devm_of_phy_get);
  * @np: node containing the phy
  * @index: index of the phy
  *
- * Gets the phy using _of_phy_get(), and associates a device with it using
- * devres. On driver detach, release function is invoked on the devres data,
+ * Gets the phy using _of_phy_get(), then gets a refcount to it,
+ * and associates a device with it using devres. On driver detach,
+ * release function is invoked on the devres data,
  * then, devres data is freed.
  *
  */
@@ -651,13 +652,21 @@ struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
                return ERR_PTR(-ENOMEM);
 
        phy = _of_phy_get(np, index);
-       if (!IS_ERR(phy)) {
-               *ptr = phy;
-               devres_add(dev, ptr);
-       } else {
+       if (IS_ERR(phy)) {
                devres_free(ptr);
+               return phy;
        }
 
+       if (!try_module_get(phy->ops->owner)) {
+               devres_free(ptr);
+               return ERR_PTR(-EPROBE_DEFER);
+       }
+
+       get_device(&phy->dev);
+
+       *ptr = phy;
+       devres_add(dev, ptr);
+
        return phy;
 }
 EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);