linux-kernel - Re: [PATCH 3.4 035/172] ALSA: hdspm - Constrain periods to 2 on older cards

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Date:	Tue, 16 Jun 2015 11:45:15 +0200
From:	Adrian Knoth <adi@...omp.erfurt.thur.de>
To:	lizf@...nel.org, stable@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	Zefan Li <lizefan@...wei.com>
Subject: Re: [PATCH 3.4 035/172] ALSA: hdspm - Constrain periods to 2 on older
 cards

On 06/16/15 10:34, lizf@...nel.org wrote:

> From: Adrian Knoth <adi@...omp.erfurt.thur.de>
> 3.4.108-rc1 review patch.  If anyone has any objections, please let me
> know.

I do.

> commit f0153c3d948c1764f6c920a0675d86fc1d75813e upstream.
> 
> diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
> index bc030a2..0627ffe 100644
> --- a/sound/pci/rme9652/hdspm.c
> +++ b/sound/pci/rme9652/hdspm.c
> @@ -6042,6 +6042,12 @@ static int snd_hdspm_capture_open(struct snd_pcm_substream *substream)
>  		snd_pcm_hw_constraint_minmax(runtime,
>  					     SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
>  					     64, 8192);
> +		snd_pcm_hw_constraint_minmax(runtime,
> +					     SNDRV_PCM_HW_PARAM_PERIODS,
> +					     2, 2);
> +		snd_pcm_hw_constraint_minmax(runtime,
> +					     SNDRV_PCM_HW_PARAM_PERIODS,
> +					     2, 2);
>  		break;
>  	}

This is not correct, those lines need to go to two different functions
(snd_hdspm_playback_open and snd_hdspm_capture_open).

Here is how the patch should look like:


diff -u -r old/hdspm.c new/hdspm.c
--- old/hdspm.c	2015-06-16 11:41:37.070389307 +0200
+++ new/hdspm.c	2015-06-16 11:44:02.101257093 +0200
@@ -6114,6 +6114,9 @@
 		snd_pcm_hw_constraint_minmax(runtime,
 					     SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
 					     64, 8192);
+		snd_pcm_hw_constraint_minmax(runtime,
+				SNDRV_PCM_HW_PARAM_PERIODS,
+				2, 2);
 		break;
 	}

@@ -6188,6 +6191,9 @@
 		snd_pcm_hw_constraint_minmax(runtime,
 					     SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
 					     64, 8192);
+		snd_pcm_hw_constraint_minmax(runtime,
+				SNDRV_PCM_HW_PARAM_PERIODS,
+				2, 2);
 		break;
 	}

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