ASoC: dmaengine: Convert to generic PCM copy ops

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

The process callback is still using the direct pointer as of now, but
it'll be converted in the next patch.

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

Reviewed-by: Mark Brown <broonie@kernel.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20230815190136.8987-22-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
index 3b99f61..f2cb757 100644 (file)
--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -287,10 +287,10 @@ static snd_pcm_uframes_t dmaengine_pcm_pointer(
                return snd_dmaengine_pcm_pointer(substream);
 }
 
-static int dmaengine_copy_user(struct snd_soc_component *component,
-                              struct snd_pcm_substream *substream,
-                              int channel, unsigned long hwoff,
-                              void __user *buf, unsigned long bytes)
+static int dmaengine_copy(struct snd_soc_component *component,
+                         struct snd_pcm_substream *substream,
+                         int channel, unsigned long hwoff,
+                         struct iov_iter *buf, unsigned long bytes)
 {
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct dmaengine_pcm *pcm = soc_component_to_pcm(component);
@@ -300,19 +300,20 @@ static int dmaengine_copy_user(struct snd_soc_component *component,
        bool is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
        void *dma_ptr = runtime->dma_area + hwoff +
                        channel * (runtime->dma_bytes / runtime->channels);
+       void *ptr = (void __force *)iter_iov_addr(buf);
 
        if (is_playback)
-               if (copy_from_user(dma_ptr, buf, bytes))
+               if (copy_from_iter(dma_ptr, bytes, buf) != bytes)
                        return -EFAULT;
 
        if (process) {
-               int ret = process(substream, channel, hwoff, (__force void *)buf, bytes);
+               int ret = process(substream, channel, hwoff, ptr, bytes);
                if (ret < 0)
                        return ret;
        }
 
        if (!is_playback)
-               if (copy_to_user(buf, dma_ptr, bytes))
+               if (copy_to_iter(dma_ptr, bytes, buf) != bytes)
                        return -EFAULT;
 
        return 0;
@@ -337,7 +338,7 @@ static const struct snd_soc_component_driver dmaengine_pcm_component_process = {
        .hw_params      = dmaengine_pcm_hw_params,
        .trigger        = dmaengine_pcm_trigger,
        .pointer        = dmaengine_pcm_pointer,
-       .copy_user      = dmaengine_copy_user,
+       .copy           = dmaengine_copy,
        .pcm_construct  = dmaengine_pcm_new,
 };