usb: musb: avoid null pointer dereference in debug logging

Since commit 511f3c53 (usb: gadget: udc-core: fix a regression during
gadget driver unbinding) usb_gadget_remove_driver will pass NULL for
the driver argument.

Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 696e9e0b05af..b7b8b2bc4ee9 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1937,7 +1937,8 @@ static int musb_gadget_stop(struct usb_gadget *g,
         stop_activity(musb, driver);
         otg_set_peripheral(musb->xceiv->otg, NULL);
 
-        dev_dbg(musb->controller, "unregistering driver %s\n", driver->function);
+        dev_dbg(musb->controller, "unregistering driver %s\n",
+                                  driver ? driver->function : "(removed)");
 
         musb->is_active = 0;
         musb->gadget_driver = NULL;