linux-kernel - [PATCH 2/4] remoteproc: mtp_scp: Constify buffer passed to scp_send

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Message-Id: <20251130-rpmsg-send-const-v1-2-cb11c7e0a024@oss.qualcomm.com>
Date: Sun, 30 Nov 2025 13:36:09 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
        Srinivas Kandagatla <srini@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc: linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-sound@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Subject: [PATCH 2/4] remoteproc: mtp_scp: Constify buffer passed to
 scp_send_ipi()

scp_send_ipi() should only send the passed buffer, without modifying its
contents, so mark pointer 'buf' as pointer to const.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>

---

Patch necessary for the further patches, please keep with the rest.
---
 drivers/remoteproc/mtk_scp.c    | 2 +-
 include/linux/rpmsg/mtk_rpmsg.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index db8fd045468d..95d5e0138a15 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -1061,7 +1061,7 @@ static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
 	scp_ipi_unregister(scp, id);
 }
 
-static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
+static int scp_send_ipi(struct platform_device *pdev, u32 id, const void *buf,
 			unsigned int len, unsigned int wait)
 {
 	struct mtk_scp *scp = platform_get_drvdata(pdev);
diff --git a/include/linux/rpmsg/mtk_rpmsg.h b/include/linux/rpmsg/mtk_rpmsg.h
index 363b60178040..badcbc89917f 100644
--- a/include/linux/rpmsg/mtk_rpmsg.h
+++ b/include/linux/rpmsg/mtk_rpmsg.h
@@ -25,7 +25,7 @@ struct mtk_rpmsg_info {
 			    ipi_handler_t handler, void *priv);
 	void (*unregister_ipi)(struct platform_device *pdev, u32 id);
 	int (*send_ipi)(struct platform_device *pdev, u32 id,
-			void *buf, unsigned int len, unsigned int wait);
+			const void *buf, unsigned int len, unsigned int wait);
 	int ns_ipi_id;
 };
 

-- 
2.48.1