The cec device node can be used right after it was created, but that
leaves a race condition where the device was created, but devnode->registered
was still false. So an ioctl() would result in an error.
So set it to true before calling cdev_device_add() and to false again if
cdev_device_add returned an error.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
---
diff --git a/drivers/media/cec/cec-core.c b/drivers/media/cec/cec-core.c
index f5d1578e256a..db7adffcdc76 100644
--- a/drivers/media/cec/cec-core.c
+++ b/drivers/media/cec/cec-core.c
@@ -128,13 +128,14 @@ static int __must_check cec_devnode_register(struct cec_devnode *devnode,
devnode->cdev.owner = owner;
kobject_set_name(&devnode->cdev.kobj, "cec%d", devnode->minor);
+ devnode->registered = true;
ret = cdev_device_add(&devnode->cdev, &devnode->dev);
if (ret) {
+ devnode->registered = false;
pr_err("%s: cdev_device_add failed\n", __func__);
goto clr_bit;
}
- devnode->registered = true;
return 0;
clr_bit:
