linux-kernel - [PATCH AUTOSEL 5.18 03/47] ASoC: qcom: lpass-platform: Update VMA access permissions in mmap callback

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Message-Id: <20220614020441.1098348-3-sashal@kernel.org>
Date:   Mon, 13 Jun 2022 22:03:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, plai@...eaurora.org,
        bgoswami@...eaurora.org, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 5.18 03/47] ASoC: qcom: lpass-platform: Update VMA access permissions in mmap callback

From: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>

[ Upstream commit ef8d89b83bf453ea9cc3c4873a84b50ff334f797 ]

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@...cinc.com>
Link: https://lore.kernel.org/r/1653660608-27245-1-git-send-email-quic_srivasam@quicinc.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/qcom/lpass-platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c
index 74d62f377dfd..ae2a7837e5cc 100644
--- 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,
-- 
2.35.1