ALSA: nm256: Convert to generic PCM copy ops

This patch converts the nm256 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/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/pci/nm256/nm256.c

···
 static int
 snd_nm256_playback_copy(struct snd_pcm_substream *substream,
 			int channel, unsigned long pos,
-			void __user *src, unsigned long count)
+			struct iov_iter *src, unsigned long count)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct nm256_stream *s = runtime->private_data;
 
-	if (copy_from_user_toio(s->bufptr + pos, src, count))
-		return -EFAULT;
-	return 0;
-}
-
-static int
-snd_nm256_playback_copy_kernel(struct snd_pcm_substream *substream,
-			       int channel, unsigned long pos,
-			       void *src, unsigned long count)
-{
-	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct nm256_stream *s = runtime->private_data;
-
-	memcpy_toio(s->bufptr + pos, src, count);
-	return 0;
+	return copy_from_iter_toio(s->bufptr + pos, src, count);
 }
 
 /*
···
 static int
 snd_nm256_capture_copy(struct snd_pcm_substream *substream,
 		       int channel, unsigned long pos,
-		       void __user *dst, unsigned long count)
+		       struct iov_iter *dst, unsigned long count)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct nm256_stream *s = runtime->private_data;
 
-	if (copy_to_user_fromio(dst, s->bufptr + pos, count))
-		return -EFAULT;
-	return 0;
-}
-
-static int
-snd_nm256_capture_copy_kernel(struct snd_pcm_substream *substream,
-			      int channel, unsigned long pos,
-			      void *dst, unsigned long count)
-{
-	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct nm256_stream *s = runtime->private_data;
-
-	memcpy_fromio(dst, s->bufptr + pos, count);
-	return 0;
+	return copy_to_iter_fromio(dst, s->bufptr + pos, count);
 }
 
 #endif /* !__i386__ */
···
 	.trigger =	snd_nm256_playback_trigger,
 	.pointer =	snd_nm256_playback_pointer,
 #ifndef __i386__
-	.copy_user =	snd_nm256_playback_copy,
-	.copy_kernel =	snd_nm256_playback_copy_kernel,
+	.copy =		snd_nm256_playback_copy,
 	.fill_silence =	snd_nm256_playback_silence,
 #endif
 	.mmap =		snd_pcm_lib_mmap_iomem,
···
 	.trigger =	snd_nm256_capture_trigger,
 	.pointer =	snd_nm256_capture_pointer,
 #ifndef __i386__
-	.copy_user =	snd_nm256_capture_copy,
-	.copy_kernel =	snd_nm256_capture_copy_kernel,
+	.copy =		snd_nm256_capture_copy,
 #endif
 	.mmap =		snd_pcm_lib_mmap_iomem,
 };