Am Samstag 03 November 2001 12:40 schrieb Thomas Sailer:
> Oliver Neukum wrote:
> > A look through usbdevfs shows that there's no locking.
>
> ???
>
> usbdevfs has devsem to prevent these races (it's a rwsem,
> reading used to access the device, disconnect requires taking
> the semaphore for writing, thus locking out readers).
Could you please point me to the locking in usb.c ?
I am probably dense there, but I find usb.c taking only drivers->serialize.
> That's the way USB locking works. The driver has to protect
> itself against disconnect, and in case transfers are still
> going on when the disconnect function is called, the driver
> has to delay termination of the disconnect function until
> it is finished using the device.
I fully agree.
Regards
Oliver
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