usb: musb: sunxi: Explicitly release USB PHY on exit

This fixes a kernel oops when unloading the driver due to usb_put_phy
being called after usb_phy_generic_unregister when the device is
detached. Calling usb_phy_generic_unregister causes x->dev->driver to
be NULL in usb_put_phy and results in a NULL pointer dereference.

Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c
index c9a09b5bb6e59dca0a7cb7ee5516b333caf18466..dc353e24d53cb6993218dfc7bd1f566877ba851b 100644 (file)
--- a/drivers/usb/musb/sunxi.c
+++ b/drivers/usb/musb/sunxi.c
@@ -297,6 +297,8 @@ static int sunxi_musb_exit(struct musb *musb)
        if (test_bit(SUNXI_MUSB_FL_HAS_SRAM, &glue->flags))
                sunxi_sram_release(musb->controller->parent);
 
+       devm_usb_put_phy(glue->dev, glue->xceiv);
+
        return 0;
 }