Clemens Ladisch wrote:
> Apparently, snd_usb_audio_disconnect hangs before returning. Please
> try to insert printk's in snd_usbmidi_disconnect as Takashi suggestes.
>
I removed the quick hack from Mathieu and inserted snd_printk's in
snd_usbmidi_disconnect.
The new function:
void snd_usbmidi_disconnect(struct list_head* p, struct usb_driver *driver)
{
snd_usb_midi_t* umidi;
int i;
umidi = list_entry(p, snd_usb_midi_t, list);
snd_printk(KERN_INFO "after list_entry\n");
// usb_driver_release_interface(driver, umidi->iface);
for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
snd_printk(KERN_INFO "in for with i=%d\n",i);
snd_usb_midi_endpoint_t* ep = &umidi->endpoints[i];
if (ep->out && ep->out->urb)
usb_unlink_urb(ep->out->urb);
snd_printk(KERN_INFO "usb_unlink_urb out\n");
if (ep->in && ep->in->urb)
usb_unlink_urb(ep->in->urb);
snd_printk(KERN_INFO "usb_unlink_urb in\n");
}
usb_driver_release_interface(driver, umidi->iface);
snd_printk(KERN_INFO "after usb_driver_release_interface\n");
}
The output from dmesg I got:
ohci_hcd 0000:00:02.0: urb e2e2b4c0 path 2.4 ep1in 5e160000 cc 5 --> status -110
hub 1-2:1.0: port 4, status 100, change 1, 12 Mb/s
usb 1-2.4: USB disconnect, address 5
usb 1-2.4: usb_disable_device nuking all URBs
usb 1-2.4: unregistering interface 1-2.4:1.0
ALSA sound/usb/usbaudio.c:2924: snd_usb_audio_disconnect called, refcount = 1
ALSA sound/usb/usbmidi.c:710: after list_entry
ALSA sound/usb/usbmidi.c:714: in for with i=0
usb 1-2.4: hcd_unlink_urb e2e2b640 fail -22
ALSA sound/usb/usbmidi.c:719: usb_unlink_urb out
usb 1-2.4: hcd_unlink_urb e2e2b4c0 fail -22
ALSA sound/usb/usbmidi.c:723: usb_unlink_urb in
ALSA sound/usb/usbmidi.c:714: in for with i=1
usb 1-2.4: hcd_unlink_urb e2e2b3c0 fail -22
ALSA sound/usb/usbmidi.c:719: usb_unlink_urb out
ALSA sound/usb/usbmidi.c:723: usb_unlink_urb in
ALSA sound/usb/usbaudio.c:2924: snd_usb_audio_disconnect called, refcount = 0
Remember this is the output for a 4x4. (If this matters)
Kindly regards, Hartmut
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