ALSA: usb - Fix possible Oops at USB-MIDI disconnection

The endpoints should be released immediately at disconnection
rather than the delayed release.  This could be a reason of Oops
at USB-audio device disconnection being used.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 9 insertions, 0 deletions

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index c0c7770198a..5962e4b8442 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1112,6 +1112,15 @@ void snd_usbmidi_disconnect(struct list_head* p)
                 }
                 if (ep->in)
                         usb_kill_urb(ep->in->urb);
+                /* free endpoints here; later call can result in Oops */
+                if (ep->out) {
+                        snd_usbmidi_out_endpoint_delete(ep->out);
+                        ep->out = NULL;
+                }
+                if (ep->in) {
+                        snd_usbmidi_in_endpoint_delete(ep->in);
+                        ep->in = NULL;
+                }
         }
         del_timer_sync(&umidi->error_timer);
 }