[PATCH 9/9] phy: core: Get a refcount to phy in devm_of_phy_get_by_index()

Kishon Vijay Abraham I
2015-12-07T13:51:28Z

From: Chunfeng Yun <chunfeng.yun@mediatek.com>

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>
---
drivers/phy/phy-core.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index fc48fac..8c7f27d 100644
--- 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);
--
1.7.9.5