Bug 478545

Description of problem:
Pulling the plug on a uvcvideo device while the device is open confuses HAL, and results in permissions being denied to it when it's re-attached.

Version-Release number of selected component (if applicable):
kernel-2.6.27.10-167.fc10.x86_64
hal-0.5.12-12.20081027git.fc10.x86_64
udev-127-3.fc10.x86_64
libv4l-0.5.7-1.fc10.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. Start Cheese, wait for preview to show.
2. Disconnect or use hotkey to disable camera. 
3. Close Cheese.
4. Reconnect camera.
5. Attempt to start Cheese --- not permission denied on /dev/video0.
6. Check what HAL thinks, note extra camera device that wasn't there before.
7. Disconnect camera.
8. Reconnect, wait some. If it doesn't work now, goto 7.
  
Actual results:
HAL confusion, permissions denied.

Expected results:
No confusion.

Additional info:
The sequence Close Cheese -> Detach -> Attach -> Start Cheese works OK with no confusion or permission problems.

Only one such device shows up in sysfs, although a number may be present in HAL.

When it's working,
[james@rhapsody ~]$ ls -Z /dev/video0
crw-rw----  root root system_u:object_r:v4l_device_t:s0 /dev/video0
[james@rhapsody ~]$ chacl -l /dev/video0
/dev/video0 [u::rw-,u:james:rw-,g::rw-,m::rw-,o::---]

Following a live-yank and reconnect,
[james@rhapsody ~]$ ls -Z /dev/video0
crw-rw----  root root system_u:object_r:v4l_device_t:s0 /dev/video0
[james@rhapsody ~]$ chacl -l /dev/video0
/dev/video0 [u::rw-,g::rw-,o::---]

After a number of live-yank cycles,
[james@rhapsody ~]$ hal-find-by-capability --capability video4linux
/org/freedesktop/Hal/devices/usb_device_402_5606_noserial_if0_video4linux_2
/org/freedesktop/Hal/devices/usb_device_402_5606_noserial_if0_video4linux_1
/org/freedesktop/Hal/devices/usb_device_402_5606_noserial_if0_video4linux_0
/org/freedesktop/Hal/devices/usb_device_402_5606_noserial_if0_video4linux

dmesg info on the camera:
uvcvideo: Found UVC 1.00 device USB2.0 Camera (0402:5606)
uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
input: USB2.0 Camera as /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/input/input27
usb 1-2: New USB device found, idVendor=0402, idProduct=5606
usb 1-2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
usb 1-2: Product: USB2.0 Camera