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media: cec: mark devnode as registered before actually registering it 

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@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2019-05-10 11:15:04 -04:00 committed by Mauro Carvalho Chehab
parent 9390467c2d
commit 354cf00339
1 changed files with 2 additions and 1 deletions
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3
drivers/media/cec/cec-core.c
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@ -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: