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>
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@ -545,12 +545,11 @@ unregister them:
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This will remove the device nodes from sysfs (causing udev to remove them
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This will remove the device nodes from sysfs (causing udev to remove them
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from /dev).
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from /dev).
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After video_unregister_device() returns no new opens can be done.
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After video_unregister_device() returns no new opens can be done. However,
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in the case of USB devices some application might still have one of these
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However, in the case of USB devices some application might still have one
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device nodes open. So after the unregister all file operations will return
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of these device nodes open. You should block all new accesses to read,
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an error as well, except for the ioctl and unlocked_ioctl file operations:
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write, poll, etc. except possibly for certain ioctl operations like
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those will still be passed on since some buffer ioctls may still be needed.
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queueing buffers.
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When the last user of the video device node exits, then the vdev->release()
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When the last user of the video device node exits, then the vdev->release()
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callback is called and you can do the final cleanup there.
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callback is called and you can do the final cleanup there.
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