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-rw-r--r--Documentation/video4linux/v4l2-framework.txt11
1 files changed, 5 insertions, 6 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 5155700..5b9205a 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -545,12 +545,11 @@ unregister them:
This will remove the device nodes from sysfs (causing udev to remove them
from /dev).
-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 device nodes open. You should block all new accesses to read,
-write, poll, etc. except possibly for certain ioctl operations like
-queueing buffers.
+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
+device nodes open. So after the unregister all file operations will return
+an error as well, except for the ioctl and unlocked_ioctl file operations:
+those will still be passed on since some buffer ioctls may still be needed.
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.