ALSA: x86: Use standard mmap helper for Intel HDMI LPE audio

Intel HDMI LPE audio driver has its own mmap callback that mimics with
the noncached page attributes, but this is rather superfluous and can
be replaced with the standard helper, as the device is only for
playback and the write-cache should suffice.

This patch drops the own code and just uses the standard helper.

Link: https://lore.kernel.org/r/20220305083308.15718-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c
index 4a3ff6468aa7597bba50d2f160d375d6b705ac18..b00634663346b99a242dc55b7353415816724da6 100644 (file)
--- a/sound/x86/intel_hdmi_audio.c
+++ b/sound/x86/intel_hdmi_audio.c
@@ -1253,18 +1253,6 @@ static snd_pcm_uframes_t had_pcm_pointer(struct snd_pcm_substream *substream)
        return len;
 }
 
-/*
- * ALSA PCM mmap callback
- */
-static int had_pcm_mmap(struct snd_pcm_substream *substream,
-                       struct vm_area_struct *vma)
-{
-       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-       return remap_pfn_range(vma, vma->vm_start,
-                       substream->runtime->dma_addr >> PAGE_SHIFT,
-                       vma->vm_end - vma->vm_start, vma->vm_page_prot);
-}
-
 /*
  * ALSA PCM ops
  */
@@ -1276,7 +1264,6 @@ static const struct snd_pcm_ops had_pcm_ops = {
        .trigger =      had_pcm_trigger,
        .sync_stop =    had_pcm_sync_stop,
        .pointer =      had_pcm_pointer,
-       .mmap =         had_pcm_mmap,
 };
 
 /* process mode change of the running stream; called in mutex */