rpmsg: Allow callback to return errors

Some rpmsg backends support holding on to and redelivering messages upon
failed handling of them, so provide a way for the callback to report and
error and allow the backends to handle this.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/samples/rpmsg/rpmsg_client_sample.c b/samples/rpmsg/rpmsg_client_sample.c
index 4fcd7ee13fb9..f161dfd3e70a 100644
--- a/samples/rpmsg/rpmsg_client_sample.c
+++ b/samples/rpmsg/rpmsg_client_sample.c
@@ -28,7 +28,7 @@ struct instance_data {
         int rx_count;
 };
 
-static void rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
+static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
                                                 void *priv, u32 src)
 {
         int ret;
@@ -43,13 +43,15 @@ static void rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
         /* samples should not live forever */
         if (idata->rx_count >= MSG_LIMIT) {
                 dev_info(&rpdev->dev, "goodbye!\n");
-                return;
+                return 0;
         }
 
         /* send a new message now */
         ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
         if (ret)
                 dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
+
+        return 0;
 }
 
 static int rpmsg_sample_probe(struct rpmsg_device *rpdev)