rpmsg: Fix documentation return formatting

kernel documentation specification:
"The return value, if any, should be described in a dedicated section
named Return."

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20211108140126.3530-1-arnaud.pouliquen@foss.st.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

drivers/rpmsg/qcom_glink_native.c

@@ -427,7 +427,7 @@ static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
  * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote.
  * Will return with refcount held, regardless of outcome.
  *
- * Returns 0 on success, negative errno otherwise.
+ * Return: 0 on success, negative errno otherwise.
  */
 static int qcom_glink_send_open_req(struct qcom_glink *glink,
 				    struct glink_channel *channel)

drivers/rpmsg/qcom_smd.c

@@ -1467,7 +1467,7 @@ ATTRIBUTE_GROUPS(qcom_smd_edge);
  * @parent:    parent device for the edge
  * @node:      device_node describing the edge
  *
- * Returns an edge reference, or negative ERR_PTR() on failure.
+ * Return: an edge reference, or negative ERR_PTR() on failure.
  */
 struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent,
 					     struct device_node *node)

drivers/rpmsg/rpmsg_core.c

@@ -26,7 +26,7 @@
  * @rpdev: rpmsg device
  * @chinfo: channel_info to bind
  *
- * Returns a pointer to the new rpmsg device on success, or NULL on error.
+ * Return: a pointer to the new rpmsg device on success, or NULL on error.
  */
 struct rpmsg_device *rpmsg_create_channel(struct rpmsg_device *rpdev,
 					  struct rpmsg_channel_info *chinfo)
@@ -48,7 +48,7 @@ EXPORT_SYMBOL(rpmsg_create_channel);
  * @rpdev: rpmsg device
  * @chinfo: channel_info to bind
  *
- * Returns 0 on success or an appropriate error value.
+ * Return: 0 on success or an appropriate error value.
  */
 int rpmsg_release_channel(struct rpmsg_device *rpdev,
 			  struct rpmsg_channel_info *chinfo)
@@ -102,7 +102,7 @@ EXPORT_SYMBOL(rpmsg_release_channel);
  * dynamically assign them an available rpmsg address (drivers should have
  * a very good reason why not to always use RPMSG_ADDR_ANY here).
  *
- * Returns a pointer to the endpoint on success, or NULL on error.
+ * Return: a pointer to the endpoint on success, or NULL on error.
  */
 struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev,
 					rpmsg_rx_cb_t cb, void *priv,
@@ -146,7 +146,7 @@ EXPORT_SYMBOL(rpmsg_destroy_ept);
  *
  * Can only be called from process context (for now).
  *
- * Returns 0 on success and an appropriate error value on failure.
+ * Return: 0 on success and an appropriate error value on failure.
  */
 int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
 {
@@ -175,7 +175,7 @@ EXPORT_SYMBOL(rpmsg_send);
  *
  * Can only be called from process context (for now).
  *
- * Returns 0 on success and an appropriate error value on failure.
+ * Return: 0 on success and an appropriate error value on failure.
  */
 int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
 {
@@ -206,7 +206,7 @@ EXPORT_SYMBOL(rpmsg_sendto);
  *
  * Can only be called from process context (for now).
  *
- * Returns 0 on success and an appropriate error value on failure.
+ * Return: 0 on success and an appropriate error value on failure.
  */
 int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
 			  void *data, int len)
@@ -235,7 +235,7 @@ EXPORT_SYMBOL(rpmsg_send_offchannel);
  *
  * Can only be called from process context (for now).
  *
- * Returns 0 on success and an appropriate error value on failure.
+ * Return: 0 on success and an appropriate error value on failure.
  */
 int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
 {
@@ -263,7 +263,7 @@ EXPORT_SYMBOL(rpmsg_trysend);
  *
  * Can only be called from process context (for now).
  *
- * Returns 0 on success and an appropriate error value on failure.
+ * Return: 0 on success and an appropriate error value on failure.
  */
 int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
 {
@@ -282,7 +282,7 @@ EXPORT_SYMBOL(rpmsg_trysendto);
  * @filp:	file for poll_wait()
  * @wait:	poll_table for poll_wait()
  *
- * Returns mask representing the current state of the endpoint's send buffers
+ * Return: mask representing the current state of the endpoint's send buffers
  */
 __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
 			poll_table *wait)
@@ -313,7 +313,7 @@ EXPORT_SYMBOL(rpmsg_poll);
  *
  * Can only be called from process context (for now).
  *
- * Returns 0 on success and an appropriate error value on failure.
+ * Return: 0 on success and an appropriate error value on failure.
  */
 int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
 			     void *data, int len)
@@ -623,7 +623,7 @@ EXPORT_SYMBOL(rpmsg_unregister_device);
  * @rpdrv: pointer to a struct rpmsg_driver
  * @owner: owning module/driver
  *
- * Returns 0 on success, and an appropriate error value on failure.
+ * Return: 0 on success, and an appropriate error value on failure.
  */
 int __register_rpmsg_driver(struct rpmsg_driver *rpdrv, struct module *owner)
 {
@@ -637,7 +637,7 @@ EXPORT_SYMBOL(__register_rpmsg_driver);
  * unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus
  * @rpdrv: pointer to a struct rpmsg_driver
  *
- * Returns 0 on success, and an appropriate error value on failure.
+ * Return: 0 on success, and an appropriate error value on failure.
  */
 void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv)
 {

drivers/rpmsg/virtio_rpmsg_bus.c

@@ -547,7 +547,7 @@ static void rpmsg_downref_sleepers(struct virtproc_info *vrp)
  * should use the appropriate rpmsg_{try}send{to, _offchannel} API
  * (see include/linux/rpmsg.h).
  *
- * Returns 0 on success and an appropriate error value on failure.
+ * Return: 0 on success and an appropriate error value on failure.
  */
 static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
 				     u32 src, u32 dst,