usb: otg: use try_module_get in all usb_get_phy functions and add missing module_put

In patch "5d3c28b usb: otg: add device tree support to otg library"
devm_usb_get_phy_by_phandle() was added. It uses try_module_get() to lock the
phy driver in memory. The corresponding module_put() is missing in that patch.

This patch adds try_module_get() to usb_get_phy() and usb_get_phy_dev().
Further the missing module_put() is added to usb_put_phy().

Tested-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Reviewed-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
index e181439..2bd03d2 100644 (file)
--- a/drivers/usb/otg/otg.c
+++ b/drivers/usb/otg/otg.c
@@ -130,7 +130,7 @@ struct usb_phy *usb_get_phy(enum usb_phy_type type)
        spin_lock_irqsave(&phy_lock, flags);
 
        phy = __usb_find_phy(&phy_list, type);
-       if (IS_ERR(phy)) {
+       if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
                pr_err("unable to find transceiver of type %s\n",
                        usb_phy_type_string(type));
                goto err0;
@@ -228,7 +228,7 @@ struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
        spin_lock_irqsave(&phy_lock, flags);
 
        phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
-       if (IS_ERR(phy)) {
+       if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
                pr_err("unable to find transceiver\n");
                goto err0;
        }
@@ -301,8 +301,12 @@ EXPORT_SYMBOL(devm_usb_put_phy);
  */
 void usb_put_phy(struct usb_phy *x)
 {
-       if (x)
+       if (x) {
+               struct module *owner = x->dev->driver->owner;
+
                put_device(x->dev);
+               module_put(owner);
+       }
 }
 EXPORT_SYMBOL(usb_put_phy);