ASoC: qcom: Convert to generic PCM copy ops

This patch converts the qcom lpass 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.
Reviewed-by: Mark Brown <broonie@kernel.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Banajit Goswami <bgoswami@quicinc.com>
Link: https://lore.kernel.org/r/20230815190136.8987-21-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/qcom/lpass-platform.c

@@ -1219,7 +1219,8 @@ static int lpass_platform_pcmops_resume(struct snd_soc_component *component)
 
 static int lpass_platform_copy(struct snd_soc_component *component,
 			       struct snd_pcm_substream *substream, int channel,
-			       unsigned long pos, void __user *buf, unsigned long bytes)
+			       unsigned long pos, struct iov_iter *buf,
+			       unsigned long bytes)
 {
 	struct snd_pcm_runtime *rt = substream->runtime;
 	unsigned int dai_id = component->id;
@@ -1230,16 +1231,16 @@ static int lpass_platform_copy(struct snd_soc_component *component,
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		if (is_cdc_dma_port(dai_id)) {
-			ret = copy_from_user_toio(dma_buf, buf, bytes);
+			ret = copy_from_iter_toio(dma_buf, buf, bytes);
 		} else {
-			if (copy_from_user((void __force *)dma_buf, buf, bytes))
+			if (copy_from_iter((void __force *)dma_buf, bytes, buf) != bytes)
 				ret = -EFAULT;
 		}
 	} else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 		if (is_cdc_dma_port(dai_id)) {
-			ret = copy_to_user_fromio(buf, dma_buf, bytes);
+			ret = copy_to_iter_fromio(buf, dma_buf, bytes);
 		} else {
-			if (copy_to_user(buf, (void __force *)dma_buf, bytes))
+			if (copy_to_iter((void __force *)dma_buf, bytes, buf) != bytes)
 				ret = -EFAULT;
 		}
 	}
@@ -1260,7 +1261,7 @@ static const struct snd_soc_component_driver lpass_component_driver = {
 	.pcm_construct	= lpass_platform_pcm_new,
 	.suspend		= lpass_platform_pcmops_suspend,
 	.resume			= lpass_platform_pcmops_resume,
-	.copy_user		= lpass_platform_copy,
+	.copy		= lpass_platform_copy,
 
 };