| Message ID | 20210219111501.14261-17-arnaud.pouliquen@foss.st.com |
|---|---|
| State | New |
| Headers | show |
| Series | introduce a generic IOCTL interface for RPMsg channels management | expand |
On Fri, Feb 19, 2021 at 12:15:01PM +0100, Arnaud Pouliquen wrote: > The rpmsg_create_ept function is invoked when the device is opened. > As only one endpoint must be created per device. It is not possible to > open the same device twice. But there is nothing to prevent multi open. s/multi/multiple > Return -EBUSY when device is already opened to have a generic error > instead of relying on the back-end to potentially detect the error. > > Without this patch for instance the GLINK driver return -EBUSY while > the virtio bus return -ENOSPC. > > Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com> > --- > drivers/rpmsg/rpmsg_char.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c > index 8d3f9d6c20ad..4cd5b79559f0 100644 > --- a/drivers/rpmsg/rpmsg_char.c > +++ b/drivers/rpmsg/rpmsg_char.c > @@ -116,6 +116,9 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) > struct device *dev = &eptdev->dev; > u32 addr = eptdev->chinfo.src; > > + if (eptdev->ept) > + return -EBUSY; > + It would be nice to return the same error code regardless of the backend but at the same time I feel like it isn't the right place to do this. I need to think about this one but for now we can keep it. > get_device(dev); > > /* > -- > 2.17.1 >
diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 8d3f9d6c20ad..4cd5b79559f0 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -116,6 +116,9 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) struct device *dev = &eptdev->dev; u32 addr = eptdev->chinfo.src; + if (eptdev->ept) + return -EBUSY; + get_device(dev); /*
The rpmsg_create_ept function is invoked when the device is opened. As only one endpoint must be created per device. It is not possible to open the same device twice. But there is nothing to prevent multi open. Return -EBUSY when device is already opened to have a generic error instead of relying on the back-end to potentially detect the error. Without this patch for instance the GLINK driver return -EBUSY while the virtio bus return -ENOSPC. Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com> --- drivers/rpmsg/rpmsg_char.c | 3 +++ 1 file changed, 3 insertions(+)