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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>
This commit is contained in:
Bjorn Andersson 2016-09-01 15:28:08 -07:00
parent e88dae5da4
commit 4b83c52a21
3 changed files with 12 additions and 8 deletions
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10
drivers/rpmsg/virtio_rpmsg_bus.c
View File

@ -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)

4
include/linux/rpmsg.h
View File

@ -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);

6
samples/rpmsg/rpmsg_client_sample.c
View File

@ -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)