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authorBjorn Andersson <bjorn.andersson@linaro.org>2016-09-01 15:28:08 -0700
committerBjorn Andersson <bjorn.andersson@linaro.org>2016-09-08 22:15:25 -0700
commit4b83c52a21cf5a7421b7c28bebf8ff28ba96ceb9 (patch)
tree750fbb5bb454ea00c2ea96859e08134cb50457bf
parente88dae5da46d3989fd6a83dd9f6806777b20d1ae (diff)
downloadlinux-stericsson-4b83c52a21cf5a7421b7c28bebf8ff28ba96ceb9.tar.gz
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>
-rw-r--r--drivers/rpmsg/virtio_rpmsg_bus.c10
-rw-r--r--include/linux/rpmsg.h4
-rw-r--r--samples/rpmsg/rpmsg_client_sample.c6
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)