Re: [BUG] usbaudio on EHCI controller

Am Mittwoch, 5. Dezember 2007 12:31:02 schrieb Brandon Philips:
> Hello-
>
> I ran into this bug while running: krecord -d /dev/dsp1 and unplugging
> my usb microphone.
>
> It is reproducible and the patch at the bottom of this email fixes it.
> However, I feel that the root cause, which I was unable to find after a
> bit of poking, isn't really fixed.

It seems to me that snd_usb_hw_free() which is exported
races with itself, as it is called from disconnect().
The way  snd_usb_audio_disconnect() operates, every exported
function needs to hold register_mutex. Something is fishy
in this driver's disconnect handling.
Brandon, your patch is correct, but there are other places,
you'd need to hold the mutex, too.

	Regards
		Oliver

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