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V4L/DVB: v4l2-framework.txt: fix incorrect statement 

After unregister_device all fileops are blocked, except for ioctls.
So it is not just the open that is blocked, others are as well.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2010-04-06 11:44:39 -03:00 committed by Mauro Carvalho Chehab
parent 626e2acfdc
commit dd1ad942ac
1 changed files with 5 additions and 6 deletions
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11
Documentation/video4linux/v4l2-framework.txt
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@ -545,12 +545,11 @@ unregister them:
This will remove the device nodes from sysfs (causing udev to remove them This will remove the device nodes from sysfs (causing udev to remove them
from /dev). from /dev).
After video_unregister_device() returns no new opens can be done. After video_unregister_device() returns no new opens can be done. However,
in the case of USB devices some application might still have one of these
However, in the case of USB devices some application might still have one device nodes open. So after the unregister all file operations will return
of these device nodes open. You should block all new accesses to read, an error as well, except for the ioctl and unlocked_ioctl file operations:
write, poll, etc. except possibly for certain ioctl operations like those will still be passed on since some buffer ioctls may still be needed.
queueing buffers.
When the last user of the video device node exits, then the vdev->release() When the last user of the video device node exits, then the vdev->release()
callback is called and you can do the final cleanup there. callback is called and you can do the final cleanup there.