[PATCH] ALSA: pcmtest: Move buffer iterator initialization to prepare callback

[Ivan Orlov <ivan.orlov0322@gmail.com>]

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.

Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.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