Am Montag, 13. Dezember 2004 09:56 schrieb li xinyi:
> Hi, all
>
> In usb.c (kernel 2.4.20, I have to work on this kernel version),
>
> function usb_start_wait_urb() sets the process state to
> TASK_UNINTERRUPTIBLE and add the process to awd.wqh before calling
> usb_submit_urb(). What is this for?
>
> And What if scheduling happens during the usb_submit_urb() but before
> it calls urb->complete to wake the process? A TASK_UNINTERRUPTIBLE
> process wont have chance to run, right? Isnt this a deadlock? (please
> correct me if I am wrong).
This is kernel code. It won't schedule unless it blocks. The preempt code
will also handle this case.
HTH
Oliver
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