linux-kernel - Re: [alsa-devel] Crash 2.6.32.x, Echo 3G, Alsa, SCSI

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Date:	Tue, 2 Feb 2010 17:02:07 +0100 (CET)
From:	Giuliano Pochini <pochini@...ise.shiny.it>
To:	Clemens Ladisch <clemens@...isch.de>
cc:	Frederick V Heitkamp <heitkamp@...ritech.net>,
	Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [alsa-devel] Crash 2.6.32.x, Echo 3G, Alsa, SCSI



On Tue, 2 Feb 2010, Clemens Ladisch wrote:

>> [ 5485.965788]  [<c10041c0>] ? do_divide_error+0x0/0x90
>> [ 5485.980619]  [<f87aa037>] ? pcm_pointer+0x37/0x70 [snd_echo3g]
>> [ 5485.998047]  [<c104764e>] ? run_timer_softirq+0x17e/0x2e0
>> [ 5486.014175]  [<f87ac9bf>] ? snd_echo_interrupt+0x11f/0x240 [snd_echo3g]
>> [ 5486.033940]  [<c107a5d5>] ? handle_IRQ_event+0x45/0x190
>
> bytes_to_frames() divides by runtime->frame_bits which is not set until
> after the hw_params callback has succeeded, but the corresponding
> chip->substream[] entry is set in that callback, by init_engine().  It
> should probably have been set in the prepare callback.

How can an irq arrive before hw_params() and prepare() ?

Frederick, are you using the midi interface ?


--
Giuliano.
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