ALSA: hdsp: Convert to generic PCM copy ops

This patch converts the hdsp 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/20230815190136.8987-13-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index 65add92c88aa650d8f8b2208bab3158f358106b7..e7d1b43471a291c0608366dc5385c77882a1589d 100644 (file)
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -3961,7 +3961,7 @@ static signed char *hdsp_channel_buffer_location(struct hdsp *hdsp,
 
 static int snd_hdsp_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 hdsp *hdsp = snd_pcm_substream_chip(substream);
        signed char *channel_buf;
@@ -3972,28 +3972,14 @@ static int snd_hdsp_playback_copy(struct snd_pcm_substream *substream,
        channel_buf = hdsp_channel_buffer_location (hdsp, substream->pstr->stream, 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_hdsp_playback_copy_kernel(struct snd_pcm_substream *substream,
-                                        int channel, unsigned long pos,
-                                        void *src, unsigned long count)
-{
-       struct hdsp *hdsp = snd_pcm_substream_chip(substream);
-       signed char *channel_buf;
-
-       channel_buf = hdsp_channel_buffer_location(hdsp, substream->pstr->stream, channel);
-       if (snd_BUG_ON(!channel_buf))
-               return -EIO;
-       memcpy(channel_buf + pos, src, count);
-       return 0;
-}
-
 static int snd_hdsp_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 hdsp *hdsp = snd_pcm_substream_chip(substream);
        signed char *channel_buf;
@@ -4004,25 +3990,11 @@ static int snd_hdsp_capture_copy(struct snd_pcm_substream *substream,
        channel_buf = hdsp_channel_buffer_location (hdsp, substream->pstr->stream, 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_hdsp_capture_copy_kernel(struct snd_pcm_substream *substream,
-                                       int channel, unsigned long pos,
-                                       void *dst, unsigned long count)
-{
-       struct hdsp *hdsp = snd_pcm_substream_chip(substream);
-       signed char *channel_buf;
-
-       channel_buf = hdsp_channel_buffer_location(hdsp, substream->pstr->stream, channel);
-       if (snd_BUG_ON(!channel_buf))
-               return -EIO;
-       memcpy(dst, channel_buf + pos, count);
-       return 0;
-}
-
 static int snd_hdsp_hw_silence(struct snd_pcm_substream *substream,
                               int channel, unsigned long pos,
                               unsigned long count)
@@ -4950,8 +4922,7 @@ static const struct snd_pcm_ops snd_hdsp_playback_ops = {
        .prepare =      snd_hdsp_prepare,
        .trigger =      snd_hdsp_trigger,
        .pointer =      snd_hdsp_hw_pointer,
-       .copy_user =    snd_hdsp_playback_copy,
-       .copy_kernel =  snd_hdsp_playback_copy_kernel,
+       .copy =         snd_hdsp_playback_copy,
        .fill_silence = snd_hdsp_hw_silence,
 };
 
@@ -4963,8 +4934,7 @@ static const struct snd_pcm_ops snd_hdsp_capture_ops = {
        .prepare =      snd_hdsp_prepare,
        .trigger =      snd_hdsp_trigger,
        .pointer =      snd_hdsp_hw_pointer,
-       .copy_user =    snd_hdsp_capture_copy,
-       .copy_kernel =  snd_hdsp_capture_copy_kernel,
+       .copy =         snd_hdsp_capture_copy,
 };
 
 static int snd_hdsp_create_hwdep(struct snd_card *card, struct hdsp *hdsp)