ASoC: qcom: lpass-platform: Update VMA access permissions in mmap callback

Replace page protection permissions from noncashed to writecombine,
in lpass codec DMA path mmp callabck, to support 64 bit chromeOS.
Avoid SIGBUS error in userspace caused by noncached permissions in
64 bit chromeOS.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Link: https://lore.kernel.org/r/1653660608-27245-1-git-send-email-quic_srivasam@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c
index f03a7ae49d505929280083e48bab010df3ea8a6d..b41ab7a321ae98a5d9447383d045d7a3a762f5bf 100644 (file)
--- a/sound/soc/qcom/lpass-platform.c
+++ b/sound/soc/qcom/lpass-platform.c
@@ -898,7 +898,7 @@ static int lpass_platform_cdc_dma_mmap(struct snd_pcm_substream *substream,
        struct snd_pcm_runtime *runtime = substream->runtime;
        unsigned long size, offset;
 
-       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+       vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
        size = vma->vm_end - vma->vm_start;
        offset = vma->vm_pgoff << PAGE_SHIFT;
        return io_remap_pfn_range(vma, vma->vm_start,