linux-kernel - Re: [PATCH] ALSA: pcmtest: Move buffer iterator initialization to prepare callback

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Message-ID: <87msz79jac.wl-tiwai@suse.de>
Date:   Fri, 04 Aug 2023 12:46:51 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Ivan Orlov <ivan.orlov0322@...il.com>
Cc:     perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: pcmtest: Move buffer iterator initialization to prepare callback

On Thu, 03 Aug 2023 17:28:24 +0200,
Ivan Orlov wrote:
> 
> Trigger callback is not the best place for buffer iterator
> initialization, so move it out to the prepare callback, where it
> have to be.
> 
> Minor enhancement: remove redundant definitions and blank line.

A blank line removal is OK, but other changes are too much to fold
into.  Please split.


thanks,

Takashi

> 
> Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
> ---
>  sound/drivers/pcmtest.c | 41 +++++++++++++++++++----------------------
>  1 file changed, 19 insertions(+), 22 deletions(-)
> 
> diff --git a/sound/drivers/pcmtest.c b/sound/drivers/pcmtest.c
> index 08e14b5eb772..7f170429eb8f 100644
> --- a/sound/drivers/pcmtest.c
> +++ b/sound/drivers/pcmtest.c
> @@ -41,8 +41,6 @@
>  #include <linux/debugfs.h>
>  #include <linux/delay.h>
>  
> -#define DEVNAME "pcmtestd"
> -#define CARD_NAME "pcm-test-card"
>  #define TIMER_PER_SEC 5
>  #define TIMER_INTERVAL (HZ / TIMER_PER_SEC)
>  #define DELAY_JIFFIES HZ
> @@ -74,11 +72,11 @@ static u8 ioctl_reset_test;
>  static struct dentry *driver_debug_dir;
>  
>  module_param(index, int, 0444);
> -MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard");
> +MODULE_PARM_DESC(index, "Index value for pcmtest soundcard");
>  module_param(id, charp, 0444);
> -MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard");
> +MODULE_PARM_DESC(id, "ID string for pcmtest soundcard");
>  module_param(enable, bool, 0444);
> -MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
> +MODULE_PARM_DESC(enable, "Enable pcmtest soundcard.");
>  module_param(fill_mode, short, 0600);
>  MODULE_PARM_DESC(fill_mode, "Buffer fill mode: rand(0) or pattern(1)");
>  module_param(inject_delay, int, 0600);
> @@ -92,7 +90,6 @@ MODULE_PARM_DESC(inject_trigger_err, "Inject EINVAL error in the 'trigger' callb
>  module_param(inject_open_err, bool, 0600);
>  MODULE_PARM_DESC(inject_open_err, "Inject EBUSY error in the 'open' callback");
>  
> -
>  struct pcmtst {
>  	struct snd_pcm *pcm;
>  	struct snd_card *card;
> @@ -405,25 +402,9 @@ static int snd_pcmtst_pcm_close(struct snd_pcm_substream *substream)
>  
>  static int snd_pcmtst_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
>  {
> -	struct snd_pcm_runtime *runtime = substream->runtime;
> -	struct pcmtst_buf_iter *v_iter = runtime->private_data;
> -
>  	if (inject_trigger_err)
>  		return -EINVAL;
>  
> -	v_iter->sample_bytes = runtime->sample_bits / 8;
> -	v_iter->period_bytes = frames_to_bytes(runtime, runtime->period_size);
> -	if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED ||
> -	    runtime->access == SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED) {
> -		v_iter->chan_block = runtime->dma_bytes / runtime->channels;
> -		v_iter->interleaved = false;
> -	} else {
> -		v_iter->interleaved = true;
> -	}
> -	// We want to record RATE * ch_cnt samples per sec, it is rate * sample_bytes * ch_cnt bytes
> -	v_iter->s_rw_ch = runtime->rate / TIMER_PER_SEC;
> -	v_iter->b_rw = v_iter->s_rw_ch * v_iter->sample_bytes * runtime->channels;
> -
>  	return 0;
>  }
>  
> @@ -454,8 +435,24 @@ static void pcmtst_pdev_release(struct device *dev)
>  
>  static int snd_pcmtst_pcm_prepare(struct snd_pcm_substream *substream)
>  {
> +	struct snd_pcm_runtime *runtime = substream->runtime;
> +	struct pcmtst_buf_iter *v_iter = runtime->private_data;
> +
>  	if (inject_prepare_err)
>  		return -EINVAL;
> +
> +	v_iter->sample_bytes = samples_to_bytes(runtime, 1);
> +	v_iter->period_bytes = snd_pcm_lib_period_bytes(substream);
> +	v_iter->interleaved = true;
> +	if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED ||
> +	    runtime->access == SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED) {
> +		v_iter->chan_block = snd_pcm_lib_buffer_bytes(substream) / runtime->channels;
> +		v_iter->interleaved = false;
> +	}
> +	// We want to record RATE * ch_cnt samples per sec, it is rate * sample_bytes * ch_cnt bytes
> +	v_iter->s_rw_ch = runtime->rate / TIMER_PER_SEC;
> +	v_iter->b_rw = v_iter->s_rw_ch * v_iter->sample_bytes * runtime->channels;
> +
>  	return 0;
>  }
>  
> -- 
> 2.34.1
>