diff mbox series

[v4,16/16] rpmsg: char: return an error if device already open

Message ID 20210217132905.1485-17-arnaud.pouliquen@foss.st.com (mailing list archive)
State Superseded
Headers show
Series introduce a generic IOCTL interface for RPMsg channels management | expand

Commit Message

Arnaud Pouliquen Feb. 17, 2021, 1:29 p.m. UTC 
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(+)
diff mbox series

Patch

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 0b0a6b7c0c9a..2eacddb83e29 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);
 
 	/*