ALSA: rme9652: Convert to generic PCM copy ops

This patch converts the rme9652 driver code to use the new unified PCM
copy callback.  It's a straightforward conversion from *_user() to
*_iter() variants.

Note that copy_from/to_iter() returns the copied bytes, hence the
error condition is adjusted accordingly.

Link: https://lore.kernel.org/r/20230815190136.8987-14-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/rme9652/rme9652.c b/sound/pci/rme9652/rme9652.c
index e7c320afefe8697addc4832e090d336a1f214bf7..d066c70ae16005888b1187c32c339f8e81a33dc5 100644 (file)
--- a/sound/pci/rme9652/rme9652.c
+++ b/sound/pci/rme9652/rme9652.c
@@ -1844,7 +1844,7 @@ static signed char *rme9652_channel_buffer_location(struct snd_rme9652 *rme9652,
 
 static int snd_rme9652_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_rme9652 *rme9652 = snd_pcm_substream_chip(substream);
        signed char *channel_buf;
@@ -1857,30 +1857,14 @@ static int snd_rme9652_playback_copy(struct snd_pcm_substream *substream,
                                                       channel);
        if (snd_BUG_ON(!channel_buf))
                return -EIO;
-       if (copy_from_user(channel_buf + pos, src, count))
+       if (copy_from_iter(channel_buf + pos, count, src) != count)
                return -EFAULT;
        return 0;
 }
 
-static int snd_rme9652_playback_copy_kernel(struct snd_pcm_substream *substream,
-                                           int channel, unsigned long pos,
-                                           void *src, unsigned long count)
-{
-       struct snd_rme9652 *rme9652 = snd_pcm_substream_chip(substream);
-       signed char *channel_buf;
-
-       channel_buf = rme9652_channel_buffer_location(rme9652,
-                                                     substream->pstr->stream,
-                                                     channel);
-       if (snd_BUG_ON(!channel_buf))
-               return -EIO;
-       memcpy(channel_buf + pos, src, count);
-       return 0;
-}
-
 static int snd_rme9652_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_rme9652 *rme9652 = snd_pcm_substream_chip(substream);
        signed char *channel_buf;
@@ -1893,27 +1877,11 @@ static int snd_rme9652_capture_copy(struct snd_pcm_substream *substream,
                                                       channel);
        if (snd_BUG_ON(!channel_buf))
                return -EIO;
-       if (copy_to_user(dst, channel_buf + pos, count))
+       if (copy_to_iter(channel_buf + pos, count, dst) != count)
                return -EFAULT;
        return 0;
 }
 
-static int snd_rme9652_capture_copy_kernel(struct snd_pcm_substream *substream,
-                                          int channel, unsigned long pos,
-                                          void *dst, unsigned long count)
-{
-       struct snd_rme9652 *rme9652 = snd_pcm_substream_chip(substream);
-       signed char *channel_buf;
-
-       channel_buf = rme9652_channel_buffer_location(rme9652,
-                                                     substream->pstr->stream,
-                                                     channel);
-       if (snd_BUG_ON(!channel_buf))
-               return -EIO;
-       memcpy(dst, channel_buf + pos, count);
-       return 0;
-}
-
 static int snd_rme9652_hw_silence(struct snd_pcm_substream *substream,
                                  int channel, unsigned long pos,
                                  unsigned long count)
@@ -2370,8 +2338,7 @@ static const struct snd_pcm_ops snd_rme9652_playback_ops = {
        .prepare =      snd_rme9652_prepare,
        .trigger =      snd_rme9652_trigger,
        .pointer =      snd_rme9652_hw_pointer,
-       .copy_user =    snd_rme9652_playback_copy,
-       .copy_kernel =  snd_rme9652_playback_copy_kernel,
+       .copy =         snd_rme9652_playback_copy,
        .fill_silence = snd_rme9652_hw_silence,
 };
 
@@ -2383,8 +2350,7 @@ static const struct snd_pcm_ops snd_rme9652_capture_ops = {
        .prepare =      snd_rme9652_prepare,
        .trigger =      snd_rme9652_trigger,
        .pointer =      snd_rme9652_hw_pointer,
-       .copy_user =    snd_rme9652_capture_copy,
-       .copy_kernel =  snd_rme9652_capture_copy_kernel,
+       .copy =         snd_rme9652_capture_copy,
 };
 
 static int snd_rme9652_create_pcm(struct snd_card *card,