[PATCH v2 10/16] rpmsg: char: allow only one endpoint per device

Arnaud Pouliquen
2020-12-22T10:59:06Z

Only one endpoint can be created per device, prevent from multi open.

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 66e01b979e72..4b0674a2e3e9 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -122,6 +122,9 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
struct rpmsg_device *rpdev = eptdev->rpdev;
struct device *dev = &eptdev->dev;

+ if (eptdev->ept)
+ return -EBUSY;
+
get_device(dev);

ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo);
--
2.17.1