Mathieu Geli wrote:
> Ok, I applied your second patch, and get this dmesg output:
>
> drivers/usb/core/usb.c: deregistering driver snd-usb-audio
> ALSA /home/mathieu/alsa-driver/usb/usbaudio.c:2944: snd_usb_audio_disconnect called,
> refcount = 1
> ALSA /home/mathieu/alsa-driver/usb/usbaudio.c:2944: snd_usb_audio_disconnect called,
> refcount = 0
Two calls to disconnect? Strange.
> ALSA /home/mathieu/alsa-driver/alsa-kernel/usb/usbmidi.c:148: urb status -104
> ALSA /home/mathieu/alsa-driver/alsa-kernel/usb/usbmidi.c:134: usb_submit_urb: -32
The driver tries to resubmit the URB although the device is being shut
down. I don't think this causes the hang, but the patch below
(already in CVS) fixes this. (-104 is -ECONNRESET which shouldn't
occur when unlinking synchronously.)
Apparently, snd_usb_audio_disconnect hangs before returning. Please
try to insert printk's in snd_usbmidi_disconnect as Takashi suggestes.
Regards,
Clemens
--
diff -u -r1.25 -r1.26
--- alsa-kernel/usb/usbmidi.c 8 Mar 2004 09:34:05 -0000 1.25
+++ alsa-kernel/usb/usbmidi.c 16 Mar 2004 16:36:05 -0000 1.26
@@ -143,8 +143,9 @@
if (status == -ENOENT)
return status; /* killed */
if (status == -EILSEQ ||
+ status == -ECONNRESET ||
status == -ETIMEDOUT)
- return -ENODEV; /* device removed */
+ return -ENODEV; /* device removed/shutdown */
snd_printk(KERN_ERR "urb status %d\n", status);
return 0; /* continue */
}
@@ -706,7 +707,6 @@
int i;
umidi = list_entry(p, snd_usb_midi_t, list);
- usb_driver_release_interface(driver, umidi->iface);
for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
snd_usb_midi_endpoint_t* ep = &umidi->endpoints[i];
if (ep->out && ep->out->urb)
@@ -714,6 +714,7 @@
if (ep->in && ep->in->urb)
usb_unlink_urb(ep->in->urb);
}
+ usb_driver_release_interface(driver, umidi->iface);
}
static void snd_usbmidi_rawmidi_free(snd_rawmidi_t* rmidi)
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