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 <[email protected]> --- Changes since v1: - None drivers/rpmsg/virtio_rpmsg_bus.c | 10 ++++++---- include/linux/rpmsg.h | 4 ++-- samples/rpmsg/rpmsg_client_sample.c | 6 ++++-- 3 files changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c index 671cb1803431..3090b0d3072f 100644 --- a/drivers/rpmsg/virtio_rpmsg_bus.c +++ b/drivers/rpmsg/virtio_rpmsg_bus.c @@ -791,8 +791,8 @@ static void rpmsg_xmit_done(struct virtqueue *svq) } /* invoked when a name service announcement arrives */ -static void rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, - void *priv, u32 src) +static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, + void *priv, u32 src) { struct rpmsg_ns_msg *msg = data; struct rpmsg_device *newch; @@ -808,7 +808,7 @@ static void rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, if (len != sizeof(*msg)) { dev_err(dev, "malformed ns msg (%d)\n", len); - return; + return -EINVAL; } /* @@ -819,7 +819,7 @@ static void rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, */ if (rpdev) { dev_err(dev, "anomaly: ns ept has an rpdev handle\n"); - return; + return -EINVAL; } /* don't trust the remote processor for null terminating the name */ @@ -842,6 +842,8 @@ static void rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, if (!newch) dev_err(dev, "rpmsg_create_channel failed\n"); } + + return 0; } static int rpmsg_probe(struct virtio_device *vdev) diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h index 71b16d37503a..452d393cc8dd 100644 --- a/include/linux/rpmsg.h +++ b/include/linux/rpmsg.h @@ -80,7 +80,7 @@ struct rpmsg_device { const struct rpmsg_device_ops *ops; }; -typedef void (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32); +typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32); /** * struct rpmsg_endpoint - binds a local rpmsg address to its user @@ -129,7 +129,7 @@ struct rpmsg_driver { const struct rpmsg_device_id *id_table; int (*probe)(struct rpmsg_device *dev); void (*remove)(struct rpmsg_device *dev); - void (*callback)(struct rpmsg_device *, void *, int, void *, u32); + int (*callback)(struct rpmsg_device *, void *, int, void *, u32); }; int register_rpmsg_device(struct rpmsg_device *dev); 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) -- 2.5.0
