rpmsg: Constify buffer passed to send API

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
index 0e03c53366094b1232778b88b6b4af55e5dfdbc4..1b670ed54cfa2ae77d3622c4924b948c4a5de21c 100644 (file)
--- 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
index 9ef17c2e45b0c1fa03538bd2a8e5080812105790..401a4ece0c9777398837d4427746fae0a5003e88 100644 (file)
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -1474,7 +1474,7 @@ unlock:
 }
 
 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
index e1eb450f4fea8c490299bd7021f2daaa955dc28c..3ac863f400ec67ea2706c473ed0bfd2eff283f68 100644 (file)
--- 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
index 948541656950a1fc80a0332d47344b6353c85560..e7f7831d37f899caf2a280dffe9f170e92da5c10 100644 (file)
--- 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
index 397e4926bd02c88aa368584e407b2e69b8a23a9c..a8b7065fd1658c6b37f34a7208abc0abc9bf835c 100644 (file)
--- 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
index 8d9e2b4dc7c108c1fd5f51fe04cfe55f50350dbf..5ae15111fb4f184a9bc63537ed33662d983d7ebb 100644 (file)
--- 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;
@@ -580,7 +581,7 @@ out:
        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;
@@ -588,8 +589,8 @@ static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
        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;
@@ -597,7 +598,8 @@ static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
        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;
@@ -605,7 +607,7 @@ static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
        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
index fb7ab91656458e10c11a39782bf7e829e6c6058b..83266ce1464204ac6f48321e43498f5c2230abb6 100644 (file)
--- 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);
@@ -249,7 +249,7 @@ 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);
@@ -257,7 +257,7 @@ static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
        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 */
@@ -267,7 +267,8 @@ 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);
@@ -275,7 +276,7 @@ static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
        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 */