From: Russell King <rmk+alsa@arm.linux.org.uk>
To: Bo Henriksen <bo.henriksen@nordicid.com>
Cc: alsa-devel@lists.sourceforge.net
Subject: Re: snd_pcm_lib_preallocate_pages_for_all
Date: Mon, 5 Jul 2004 10:00:39 +0100 [thread overview]
Message-ID: <20040705100038.B17721@flint.arm.linux.org.uk> (raw)
In-Reply-To: <A6991F0FA073F34C94E97976CAC0323116F8CA@server2.nordicid.com>; from bo.henriksen@nordicid.com on Mon, Jul 05, 2004 at 11:56:25AM +0300
On Mon, Jul 05, 2004 at 11:56:25AM +0300, Bo Henriksen wrote:
> It now crashes again. I have tried to preallocate the buffer using
> dma_alloc_coherent and free it with dma_free_coherent. This succeeds and
> I am using this in other drivers as well. I guess I am missing something
> else?
Yes, ALSA assumes that memory returned from dma_alloc_coherent is
kernel direct mapped memory. ALSA is wrong in that assumption.
Hopefully ALSA people can help you further.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
2.6 Serial core
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next prev parent reply other threads:[~2004-07-05 9:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-05 8:56 snd_pcm_lib_preallocate_pages_for_all Bo Henriksen
2004-07-05 9:00 ` Russell King [this message]
2004-07-05 9:17 ` snd_pcm_lib_preallocate_pages_for_all Takashi Iwai
-- strict thread matches above, loose matches on Subject: below --
2004-07-05 10:57 snd_pcm_lib_preallocate_pages_for_all Bo Henriksen
2004-07-05 11:10 ` snd_pcm_lib_preallocate_pages_for_all Takashi Iwai
2004-07-06 8:34 ` snd_pcm_lib_preallocate_pages_for_all Jaroslav Kysela
2004-07-05 7:03 snd_pcm_lib_preallocate_pages_for_all Bo Henriksen
2004-07-05 8:15 ` snd_pcm_lib_preallocate_pages_for_all Russell King
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