From mboxrd@z Thu Jan  1 00:00:00 1970
From: thomas schorpp <t.schorpp@gmx.de>
Subject: Re: snd-usb-audio hangs modprobe if switching dv camera
 betw. webcam / usb mass storage mode
Date: Mon, 01 Aug 2005 13:18:42 +0200
Message-ID: <42EE0512.6050302@gmx.de>
References: <42EC96D0.7050000@gmx.de> <42ECB0D7.4030409@gmx.de> <42EDD139.1000306@gmx.de>
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thomas schorpp wrote:
> thomas schorpp wrote:
> 
>>thomas schorpp wrote:
>>
>>
>>>hello,
>>>
>>>this bug is in conjunction with the older
>>>"usb disconnect hangs keyboard" bug on lkml.
>>>
>>>module-init-tools / hotplug hangs with snd-usb-audio if i switch/remove
>>>usb camera as stated above, if  a client like kmix is attached.
>>>(strange, since this device has no mixers here).
>>>

sorry wrong driver, done this:

Aug  1 13:11:18 tom1 kernel: usb 1-2: USB disconnect, address 22
Aug  1 13:11:18 tom1 kernel: ALSA sound/usb/usbaudio.c:3275:
snd_usb_audio_disconnect
Aug  1 13:11:18 tom1 kernel: ALSA sound/usb/usbaudio.c:3284: 1
Aug  1 13:11:18 tom1 kernel: ALSA sound/usb/usbaudio.c:3289: 2
Aug  1 13:11:18 tom1 kernel: ALSA sound/usb/usbaudio.c:3296: free

... kill kmix ...

Aug  1 13:12:51 tom1 kernel: ALSA sound/usb/usbaudio.c:3301: freed
Aug  1 13:12:52 tom1 kernel: usb 1-2: new full speed USB device using
uhci_hcd and address 23
Aug  1 13:12:52 tom1 kernel: scsi9 : SCSI emulation for USB Mass Storage
devices


static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
{
	snd_usb_audio_t *chip;
	snd_card_t *card;
	struct list_head *p;

	if (ptr == (void *)-1L)
		return;
	
	snd_printk(KERN_ERR "snd_usb_audio_disconnect\n");

	chip = ptr;
	card = chip->card;
	down(&register_mutex);
	chip->shutdown = 1;
	chip->num_interfaces--;
	if (chip->num_interfaces <= 0) {
		snd_card_disconnect(card);
	snd_printk(KERN_ERR "1\n");
		/* release the pcm resources */
		list_for_each(p, &chip->pcm_list) {
			snd_usb_stream_disconnect(p, &usb_audio_driver);
		}
	snd_printk(KERN_ERR "2\n");
		/* release the midi resources */
		list_for_each(p, &chip->midi_list) {
			snd_usbmidi_disconnect(p, &usb_audio_driver);
		}
		usb_chip[chip->index] = NULL;
		up(&register_mutex);
	snd_printk(KERN_ERR "free\n");
		snd_card_free(card); <----- HANGS HERE
	} else {
		up(&register_mutex);
	}
	snd_printk(KERN_ERR "freed\n");


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