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
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
At this point the usb was down not responding anymore, like in the past.
what I did next, is put double each interesting lines printk, what I get is, that the
rmmod of the driver was hanging on the midi ressources cleaning stuff.
Hum, first reflex: I just comment out those 3 lines =) and guess what.. that works
fine now. I tried to plug/unplug several times my mouse, the midisport, and everything
works fine, so... I don't really know what was the bug's reason, but as long as that
works I'm happy ;-)
Probably Takashi Iwai who seems to has coded it should once have a look to understand
the 'why' question.
Cheers,
Mathieu
--
Here is finally the modifications I applied:
--- alsa-kernel/usb/usbmidi.c 3 Mar 2004 11:35:15 -0000 1.24
+++ alsa-kernel/usb/usbmidi.c 8 Mar 2004 09:34:05 -0000 1.25
@@ -453,8 +453,16 @@
usbmidi_out_port_t* port =
(usbmidi_out_port_t*)substream->runtime->private_data;
port->active = up;
- if (up)
+ if (up) {
+ if (port->ep->umidi->chip->shutdown) {
+ /* gobble up remaining bytes to prevent wait in
+ * snd_rawmidi_drain_output */
+ while (!snd_rawmidi_transmit_empty(substream))
+ snd_rawmidi_transmit_ack(substream, 1);
+ return;
+ }
tasklet_hi_schedule(&port->ep->tasklet);
+ }
}
static int snd_usbmidi_input_open(snd_rawmidi_substream_t* substream)
--- alsa-kernel/usb/usbaudio.c 2004-03-11 21:00:25.000000000 +0100
+++ alsa-kernel/usb/usbaudio.c 2004-03-13 04:01:06.000000000 +0100
@@ -2939,9 +2939,9 @@
snd_usb_stream_disconnect(p, &usb_audio_driver);
}
/* release the midi resources */
- list_for_each(p, &chip->midi_list) {
- snd_usbmidi_disconnect(p, &usb_audio_driver);
- }
+ /* list_for_each(p, &chip->midi_list) { */
+ /* snd_usbmidi_disconnect(p, &usb_audio_driver); */
+ /* } */
up(®ister_mutex);
snd_card_free_in_thread(card);
} else {
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