Re: [PATCH 1/5] USB: cdc-acm: fix device unregistration

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On Wednesday 27 February 2013 13:52:26 Johan Hovold wrote:
> Unregister tty device in disconnect as is required by the USB stack.
> 
> By deferring unregistration to when the last tty reference is dropped,
> the parent interface device can get unregistered before the child
> resulting in broken hotplug events being generated when the tty is
> finally closed:
> 
> KERNEL[2290.798128] remove   /devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:3.1 (usb)
> KERNEL[2290.804589] remove   /devices/pci0000:00/0000:00:1d.7/usb2/2-1 (usb)
> KERNEL[2294.554799] remove   /2-1:3.1/tty/ttyACM0 (tty)
> 
> The driver must deal with tty callbacks after disconnect by checking the
> disconnected flag. Specifically, further opens must be prevented and
> this is already implemented.
> 
> Cc: stable <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Acked-by: Oliver Neukum <oneukum@xxxxxxx>
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