ALSA: sh: Convert to generic PCM copy ops

This patch converts the sh_dac_audio driver code to use the new
unified PCM copy callback.  It's a straightforward conversion from
*_user() to *_iter() variants.

Link: https://lore.kernel.org/r/20230815190136.8987-15-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/sh/sh_dac_audio.c

@@ -158,12 +158,12 @@ static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 
 static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream,
 			       int channel, unsigned long pos,
-			       void __user *src, unsigned long count)
+			       struct iov_iter *src, unsigned long count)
 {
 	/* channel is not used (interleaved data) */
 	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
 
-	if (copy_from_user_toio(chip->data_buffer + pos, src, count))
+	if (copy_from_iter_toio(chip->data_buffer + pos, src, count))
 		return -EFAULT;
 	chip->buffer_end = chip->data_buffer + pos + count;
 
@@ -175,24 +175,6 @@ static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream,
 	return 0;
 }
 
-static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream,
-				      int channel, unsigned long pos,
-				      void *src, unsigned long count)
-{
-	/* channel is not used (interleaved data) */
-	struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
-
-	memcpy_toio(chip->data_buffer + pos, src, count);
-	chip->buffer_end = chip->data_buffer + pos + count;
-
-	if (chip->empty) {
-		chip->empty = 0;
-		dac_audio_start_timer(chip);
-	}
-
-	return 0;
-}
-
 static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
 				  int channel, unsigned long pos,
 				  unsigned long count)
@@ -227,8 +209,7 @@ static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
 	.prepare	= snd_sh_dac_pcm_prepare,
 	.trigger	= snd_sh_dac_pcm_trigger,
 	.pointer	= snd_sh_dac_pcm_pointer,
-	.copy_user	= snd_sh_dac_pcm_copy,
-	.copy_kernel	= snd_sh_dac_pcm_copy_kernel,
+	.copy		= snd_sh_dac_pcm_copy,
 	.fill_silence	= snd_sh_dac_pcm_silence,
 	.mmap		= snd_pcm_lib_mmap_iomem,
 };