linux-kernel - Re: ALSA: cs5535audio: correctly set dma->substream

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Message-ID: <20070830144436.GH5851@cosmic.amd.com>
Date:	Thu, 30 Aug 2007 08:44:37 -0600
From:	"Jordan Crouse" <jordan.crouse@....com>
To:	"Andres Salomon" <dilinger@...ued.net>
cc:	jayakumar.alsa@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, info-linux@...de.amd.com
Subject: Re: ALSA: cs5535audio: correctly set dma->substream

On 29/08/07 23:28 -0400, Andres Salomon wrote:
> 
> We're never actually setting dma->substream to the current substream; that
> means the dma->substream checks that we do in the suspend/resume path
> are never satisfied, and the PRD registers are never correctly managed.  This
> changes it so that we set the substream when constructing the specific
> bus master DMA, and unsetting it when we tear down the BM's DMA.
> 
> Signed-off-by: Andres Salomon <dilinger@...ian.org>
Acked-by: Jordan Crouse <jordan.crouse@....com>

> ---
> 
>  sound/pci/cs5535audio/cs5535audio_pcm.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/sound/pci/cs5535audio/cs5535audio_pcm.c b/sound/pci/cs5535audio/cs5535audio_pcm.c
> index 5450a9e..e61f972 100644
> --- a/sound/pci/cs5535audio/cs5535audio_pcm.c
> +++ b/sound/pci/cs5535audio/cs5535audio_pcm.c
> @@ -164,6 +164,7 @@ static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
>  	jmpprd_addr = cpu_to_le32(lastdesc->addr +
>  				  (sizeof(struct cs5535audio_dma_desc)*periods));
>  
> +	dma->substream = substream;
>  	dma->period_bytes = period_bytes;
>  	dma->periods = periods;
>  	spin_lock_irq(&cs5535au->reg_lock);
> @@ -241,6 +242,7 @@ static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
>  {
>  	snd_dma_free_pages(&dma->desc_buf);
>  	dma->desc_buf.area = NULL;
> +	dma->substream = NULL;
>  }
>  
>  static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
> 
> 

-- 
Jordan Crouse
Systems Software Development Engineer 
Advanced Micro Devices, Inc.


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