rpmsg: Constify buffer passed to send API

krzk · andersson · commit b8077b4da2e8 · 2026-04-06T09:37:51.000-05:00
The rpmsg_send(), rpmsg_sendto() and other variants of sending interfaces should only send the passed data, without modifying its contents, so mark pointer 'data' as pointer to const. All users of this interface already follow this approach, so only the function declarations have to be updated. Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Link: https://lore.kernel.org/r/20260317-rpmsg-send-const-v3-3-4d7fd27f037f@oss.qualcomm.com Signed-off-by: Bjorn Andersson <andersson@kernel.org>
diff --git a/drivers/rpmsg/mtk_rpmsg.c b/drivers/rpmsg/mtk_rpmsg.c
@@ -135,7 +135,7 @@ static void mtk_rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
 	kref_put(&ept->refcount, __mtk_ept_release);
 }
 
-static int mtk_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+static int mtk_rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct mtk_rpmsg_rproc_subdev *mtk_subdev =
 		to_mtk_rpmsg_endpoint(ept)->mtk_subdev;
@@ -144,7 +144,7 @@ static int mtk_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
 					  len, 0);
 }
 
-static int mtk_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static int mtk_rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct mtk_rpmsg_rproc_subdev *mtk_subdev =
 		to_mtk_rpmsg_endpoint(ept)->mtk_subdev;
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
@@ -1474,7 +1474,7 @@ static int qcom_glink_request_intent(struct qcom_glink *glink,
 }
 
 static int __qcom_glink_send(struct glink_channel *channel,
-			     void *data, int len, bool wait)
+			     const void *data, int len, bool wait)
 {
 	struct qcom_glink *glink = channel->glink;
 	struct glink_core_rx_intent *intent = NULL;
@@ -1553,28 +1553,31 @@ static int __qcom_glink_send(struct glink_channel *channel,
 	return 0;
 }
 
-static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
+static int qcom_glink_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
 
 	return __qcom_glink_send(channel, data, len, true);
 }
 
-static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static int qcom_glink_trysend(struct rpmsg_endpoint *ept, const void *data,
+			      int len)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
 
 	return __qcom_glink_send(channel, data, len, false);
 }
 
-static int qcom_glink_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+static int qcom_glink_sendto(struct rpmsg_endpoint *ept, const void *data,
+			     int len, u32 dst)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
 
 	return __qcom_glink_send(channel, data, len, true);
 }
 
-static int qcom_glink_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+static int qcom_glink_trysendto(struct rpmsg_endpoint *ept, const void *data,
+				int len, u32 dst)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
 
diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
@@ -960,28 +960,30 @@ static void qcom_smd_destroy_ept(struct rpmsg_endpoint *ept)
 	kref_put(&ept->refcount, __ept_release);
 }
 
-static int qcom_smd_send(struct rpmsg_endpoint *ept, void *data, int len)
+static int qcom_smd_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);
 
 	return __qcom_smd_send(qsept->qsch, data, len, true);
 }
 
-static int qcom_smd_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static int qcom_smd_trysend(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);
 
 	return __qcom_smd_send(qsept->qsch, data, len, false);
 }
 
-static int qcom_smd_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+static int qcom_smd_sendto(struct rpmsg_endpoint *ept, const void *data, int len,
+			   u32 dst)
 {
 	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);
 
 	return __qcom_smd_send(qsept->qsch, data, len, true);
 }
 
-static int qcom_smd_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+static int qcom_smd_trysendto(struct rpmsg_endpoint *ept, const void *data,
+			      int len, u32 dst)
 {
 	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);
 
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
@@ -153,7 +153,7 @@ EXPORT_SYMBOL(rpmsg_destroy_ept);
  *
  * Return: 0 on success and an appropriate error value on failure.
  */
-int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+int rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	if (WARN_ON(!ept))
 		return -EINVAL;
@@ -182,7 +182,7 @@ EXPORT_SYMBOL(rpmsg_send);
  *
  * Return: 0 on success and an appropriate error value on failure.
  */
-int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+int rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst)
 {
 	if (WARN_ON(!ept))
 		return -EINVAL;
@@ -210,7 +210,7 @@ EXPORT_SYMBOL(rpmsg_sendto);
  *
  * Return: 0 on success and an appropriate error value on failure.
  */
-int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+int rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	if (WARN_ON(!ept))
 		return -EINVAL;
@@ -238,7 +238,7 @@ EXPORT_SYMBOL(rpmsg_trysend);
  *
  * Return: 0 on success and an appropriate error value on failure.
  */
-int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+int rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst)
 {
 	if (WARN_ON(!ept))
 		return -EINVAL;
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
@@ -63,11 +63,11 @@ struct rpmsg_device_ops {
 struct rpmsg_endpoint_ops {
 	void (*destroy_ept)(struct rpmsg_endpoint *ept);
 
-	int (*send)(struct rpmsg_endpoint *ept, void *data, int len);
-	int (*sendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+	int (*send)(struct rpmsg_endpoint *ept, const void *data, int len);
+	int (*sendto)(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst);
 
-	int (*trysend)(struct rpmsg_endpoint *ept, void *data, int len);
-	int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+	int (*trysend)(struct rpmsg_endpoint *ept, const void *data, int len);
+	int (*trysendto)(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst);
 	__poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
 			     poll_table *wait);
 	int (*set_flow_control)(struct rpmsg_endpoint *ept, bool pause, u32 dst);
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -136,11 +136,12 @@ struct virtio_rpmsg_channel {
 #define RPMSG_RESERVED_ADDRESSES	(1024)
 
 static void virtio_rpmsg_destroy_ept(struct rpmsg_endpoint *ept);
-static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
-static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
-			       u32 dst);
-static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
-static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len);
+static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data,
+			       int len, u32 dst);
+static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data,
+				int len);
+static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data,
 				  int len, u32 dst);
 static __poll_t virtio_rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
 				  poll_table *wait);
@@ -490,7 +491,7 @@ static void *get_a_tx_buf(struct virtproc_info *vrp)
  */
 static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
 				     u32 src, u32 dst,
-				     void *data, int len, bool wait)
+				     const void *data, int len, bool wait)
 {
 	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
 	struct virtproc_info *vrp = vch->vrp;
@@ -580,32 +581,33 @@ static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
 	return err;
 }
 
-static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct rpmsg_device *rpdev = ept->rpdev;
 	u32 src = ept->addr, dst = rpdev->dst;
 
 	return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
 }
 
-static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
-			       u32 dst)
+static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data,
+			       int len, u32 dst)
 {
 	struct rpmsg_device *rpdev = ept->rpdev;
 	u32 src = ept->addr;
 
 	return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
 }
 
-static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data,
+				int len)
 {
 	struct rpmsg_device *rpdev = ept->rpdev;
 	u32 src = ept->addr, dst = rpdev->dst;
 
 	return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
 }
 
-static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data,
 				  int len, u32 dst)
 {
 	struct rpmsg_device *rpdev = ept->rpdev;
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
@@ -182,11 +182,11 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
 					rpmsg_rx_cb_t cb, void *priv,
 					struct rpmsg_channel_info chinfo);
 
-int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
-int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+int rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len);
+int rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst);
 
-int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
-int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+int rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data, int len);
+int rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst);
 
 __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
 			poll_table *wait);
@@ -249,15 +249,15 @@ static inline struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev
 	return NULL;
 }
 
-static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+static inline int rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	/* This shouldn't be possible */
 	WARN_ON(1);
 
 	return -ENXIO;
 }
 
-static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
+static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data, int len,
 			       u32 dst)
 {
 	/* This shouldn't be possible */
@@ -267,15 +267,16 @@ static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
 
 }
 
-static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data,
+				int len)
 {
 	/* This shouldn't be possible */
 	WARN_ON(1);
 
 	return -ENXIO;
 }
 
-static inline int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+static inline int rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data,
 				  int len, u32 dst)
 {
 	/* This shouldn't be possible */

Original file line number	Diff line number	Diff line change
`@@ -135,7 +135,7 @@ static void mtk_rpmsg_destroy_ept(struct rpmsg_endpoint *ept)`
`135`	`135`	`kref_put(&ept->refcount, __mtk_ept_release);`
`136`	`136`	`}`
`137`	`137`
`138`		`-static int mtk_rpmsg_send(struct rpmsg_endpoint ept, void data, int len)`
	`138`	`+static int mtk_rpmsg_send(struct rpmsg_endpoint ept, const void data, int len)`
`139`	`139`	`{`
`140`	`140`	`struct mtk_rpmsg_rproc_subdev *mtk_subdev =`
`141`	`141`	`to_mtk_rpmsg_endpoint(ept)->mtk_subdev;`
`@@ -144,7 +144,7 @@ static int mtk_rpmsg_send(struct rpmsg_endpoint ept, void data, int len)`
`144`	`144`	`len, 0);`
`145`	`145`	`}`
`146`	`146`
`147`		`-static int mtk_rpmsg_trysend(struct rpmsg_endpoint ept, void data, int len)`
	`147`	`+static int mtk_rpmsg_trysend(struct rpmsg_endpoint ept, const void data, int len)`
`148`	`148`	`{`
`149`	`149`	`struct mtk_rpmsg_rproc_subdev *mtk_subdev =`
`150`	`150`	`to_mtk_rpmsg_endpoint(ept)->mtk_subdev;`
Original file line number	Diff line number	Diff line change
`@@ -1474,7 +1474,7 @@ static int qcom_glink_request_intent(struct qcom_glink *glink,`
`1474`	`1474`	`}`
`1475`	`1475`
`1476`	`1476`	`static int __qcom_glink_send(struct glink_channel *channel,`
`1477`		`- void *data, int len, bool wait)`
	`1477`	`+ const void *data, int len, bool wait)`
`1478`	`1478`	`{`
`1479`	`1479`	`struct qcom_glink *glink = channel->glink;`
`1480`	`1480`	`struct glink_core_rx_intent *intent = NULL;`
`@@ -1553,28 +1553,31 @@ static int __qcom_glink_send(struct glink_channel *channel,`
`1553`	`1553`	`return 0;`
`1554`	`1554`	`}`
`1555`	`1555`
`1556`		`-static int qcom_glink_send(struct rpmsg_endpoint ept, void data, int len)`
	`1556`	`+static int qcom_glink_send(struct rpmsg_endpoint ept, const void data, int len)`
`1557`	`1557`	`{`
`1558`	`1558`	`struct glink_channel *channel = to_glink_channel(ept);`
`1559`	`1559`
`1560`	`1560`	`return __qcom_glink_send(channel, data, len, true);`
`1561`	`1561`	`}`
`1562`	`1562`
`1563`		`-static int qcom_glink_trysend(struct rpmsg_endpoint ept, void data, int len)`
	`1563`	`+static int qcom_glink_trysend(struct rpmsg_endpoint ept, const void data,`
	`1564`	`+ int len)`
`1564`	`1565`	`{`
`1565`	`1566`	`struct glink_channel *channel = to_glink_channel(ept);`
`1566`	`1567`
`1567`	`1568`	`return __qcom_glink_send(channel, data, len, false);`
`1568`	`1569`	`}`
`1569`	`1570`
`1570`		`-static int qcom_glink_sendto(struct rpmsg_endpoint ept, void data, int len, u32 dst)`
	`1571`	`+static int qcom_glink_sendto(struct rpmsg_endpoint ept, const void data,`
	`1572`	`+ int len, u32 dst)`
`1571`	`1573`	`{`
`1572`	`1574`	`struct glink_channel *channel = to_glink_channel(ept);`
`1573`	`1575`
`1574`	`1576`	`return __qcom_glink_send(channel, data, len, true);`
`1575`	`1577`	`}`
`1576`	`1578`
`1577`		`-static int qcom_glink_trysendto(struct rpmsg_endpoint ept, void data, int len, u32 dst)`
	`1579`	`+static int qcom_glink_trysendto(struct rpmsg_endpoint ept, const void data,`
	`1580`	`+ int len, u32 dst)`
`1578`	`1581`	`{`
`1579`	`1582`	`struct glink_channel *channel = to_glink_channel(ept);`
`1580`	`1583`
Original file line number	Diff line number	Diff line change
`@@ -960,28 +960,30 @@ static void qcom_smd_destroy_ept(struct rpmsg_endpoint *ept)`
`960`	`960`	`kref_put(&ept->refcount, __ept_release);`
`961`	`961`	`}`
`962`	`962`
`963`		`-static int qcom_smd_send(struct rpmsg_endpoint ept, void data, int len)`
	`963`	`+static int qcom_smd_send(struct rpmsg_endpoint ept, const void data, int len)`
`964`	`964`	`{`
`965`	`965`	`struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);`
`966`	`966`
`967`	`967`	`return __qcom_smd_send(qsept->qsch, data, len, true);`
`968`	`968`	`}`
`969`	`969`
`970`		`-static int qcom_smd_trysend(struct rpmsg_endpoint ept, void data, int len)`
	`970`	`+static int qcom_smd_trysend(struct rpmsg_endpoint ept, const void data, int len)`
`971`	`971`	`{`
`972`	`972`	`struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);`
`973`	`973`
`974`	`974`	`return __qcom_smd_send(qsept->qsch, data, len, false);`
`975`	`975`	`}`
`976`	`976`
`977`		`-static int qcom_smd_sendto(struct rpmsg_endpoint ept, void data, int len, u32 dst)`
	`977`	`+static int qcom_smd_sendto(struct rpmsg_endpoint ept, const void data, int len,`
	`978`	`+ u32 dst)`
`978`	`979`	`{`
`979`	`980`	`struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);`
`980`	`981`
`981`	`982`	`return __qcom_smd_send(qsept->qsch, data, len, true);`
`982`	`983`	`}`
`983`	`984`
`984`		`-static int qcom_smd_trysendto(struct rpmsg_endpoint ept, void data, int len, u32 dst)`
	`985`	`+static int qcom_smd_trysendto(struct rpmsg_endpoint ept, const void data,`
	`986`	`+ int len, u32 dst)`
`985`	`987`	`{`
`986`	`988`	`struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);`
`987`	`989`
Original file line number	Diff line number	Diff line change
`@@ -153,7 +153,7 @@ EXPORT_SYMBOL(rpmsg_destroy_ept);`
`153`	`153`	`*`
`154`	`154`	`* Return: 0 on success and an appropriate error value on failure.`
`155`	`155`	`*/`
`156`		`-int rpmsg_send(struct rpmsg_endpoint ept, void data, int len)`
	`156`	`+int rpmsg_send(struct rpmsg_endpoint ept, const void data, int len)`
`157`	`157`	`{`
`158`	`158`	`if (WARN_ON(!ept))`
`159`	`159`	`return -EINVAL;`
`@@ -182,7 +182,7 @@ EXPORT_SYMBOL(rpmsg_send);`
`182`	`182`	`*`
`183`	`183`	`* Return: 0 on success and an appropriate error value on failure.`
`184`	`184`	`*/`
`185`		`-int rpmsg_sendto(struct rpmsg_endpoint ept, void data, int len, u32 dst)`
	`185`	`+int rpmsg_sendto(struct rpmsg_endpoint ept, const void data, int len, u32 dst)`
`186`	`186`	`{`
`187`	`187`	`if (WARN_ON(!ept))`
`188`	`188`	`return -EINVAL;`
`@@ -210,7 +210,7 @@ EXPORT_SYMBOL(rpmsg_sendto);`
`210`	`210`	`*`
`211`	`211`	`* Return: 0 on success and an appropriate error value on failure.`
`212`	`212`	`*/`
`213`		`-int rpmsg_trysend(struct rpmsg_endpoint ept, void data, int len)`
	`213`	`+int rpmsg_trysend(struct rpmsg_endpoint ept, const void data, int len)`
`214`	`214`	`{`
`215`	`215`	`if (WARN_ON(!ept))`
`216`	`216`	`return -EINVAL;`
`@@ -238,7 +238,7 @@ EXPORT_SYMBOL(rpmsg_trysend);`
`238`	`238`	`*`
`239`	`239`	`* Return: 0 on success and an appropriate error value on failure.`
`240`	`240`	`*/`
`241`		`-int rpmsg_trysendto(struct rpmsg_endpoint ept, void data, int len, u32 dst)`
	`241`	`+int rpmsg_trysendto(struct rpmsg_endpoint ept, const void data, int len, u32 dst)`
`242`	`242`	`{`
`243`	`243`	`if (WARN_ON(!ept))`
`244`	`244`	`return -EINVAL;`
Original file line number	Diff line number	Diff line change
`@@ -182,11 +182,11 @@ struct rpmsg_endpoint rpmsg_create_ept(struct rpmsg_device ,`
`182`	`182`	`rpmsg_rx_cb_t cb, void *priv,`
`183`	`183`	`struct rpmsg_channel_info chinfo);`
`184`	`184`
`185`		`-int rpmsg_send(struct rpmsg_endpoint ept, void data, int len);`
`186`		`-int rpmsg_sendto(struct rpmsg_endpoint ept, void data, int len, u32 dst);`
	`185`	`+int rpmsg_send(struct rpmsg_endpoint ept, const void data, int len);`
	`186`	`+int rpmsg_sendto(struct rpmsg_endpoint ept, const void data, int len, u32 dst);`
`187`	`187`
`188`		`-int rpmsg_trysend(struct rpmsg_endpoint ept, void data, int len);`
`189`		`-int rpmsg_trysendto(struct rpmsg_endpoint ept, void data, int len, u32 dst);`
	`188`	`+int rpmsg_trysend(struct rpmsg_endpoint ept, const void data, int len);`
	`189`	`+int rpmsg_trysendto(struct rpmsg_endpoint ept, const void data, int len, u32 dst);`
`190`	`190`
`191`	`191`	`__poll_t rpmsg_poll(struct rpmsg_endpoint ept, struct file filp,`
`192`	`192`	`poll_table *wait);`
`@@ -249,15 +249,15 @@ static inline struct rpmsg_endpoint rpmsg_create_ept(struct rpmsg_device rpdev`
`249`	`249`	`return NULL;`
`250`	`250`	`}`
`251`	`251`
`252`		`-static inline int rpmsg_send(struct rpmsg_endpoint ept, void data, int len)`
	`252`	`+static inline int rpmsg_send(struct rpmsg_endpoint ept, const void data, int len)`
`253`	`253`	`{`
`254`	`254`	`/* This shouldn't be possible */`
`255`	`255`	`WARN_ON(1);`
`256`	`256`
`257`	`257`	`return -ENXIO;`
`258`	`258`	`}`
`259`	`259`
`260`		`-static inline int rpmsg_sendto(struct rpmsg_endpoint ept, void data, int len,`
	`260`	`+static inline int rpmsg_sendto(struct rpmsg_endpoint ept, const void data, int len,`
`261`	`261`	`u32 dst)`
`262`	`262`	`{`
`263`	`263`	`/* This shouldn't be possible */`
`@@ -267,15 +267,16 @@ static inline int rpmsg_sendto(struct rpmsg_endpoint ept, void data, int len,`
`267`	`267`
`268`	`268`	`}`
`269`	`269`
`270`		`-static inline int rpmsg_trysend(struct rpmsg_endpoint ept, void data, int len)`
	`270`	`+static inline int rpmsg_trysend(struct rpmsg_endpoint ept, const void data,`
	`271`	`+ int len)`
`271`	`272`	`{`
`272`	`273`	`/* This shouldn't be possible */`
`273`	`274`	`WARN_ON(1);`
`274`	`275`
`275`	`276`	`return -ENXIO;`
`276`	`277`	`}`
`277`	`278`
`278`		`-static inline int rpmsg_trysendto(struct rpmsg_endpoint ept, void data,`
	`279`	`+static inline int rpmsg_trysendto(struct rpmsg_endpoint ept, const void data,`
`279`	`280`	`int len, u32 dst)`
`280`	`281`	`{`
`281`	`282`	`/* This shouldn't be possible */`