USB_BLOCK_URB(9)                          USB Core APIs                          USB_BLOCK_URB(9)



NAME
       usb_block_urb - reliably prevent further use of an URB

SYNOPSIS
       void usb_block_urb(struct urb * urb);

ARGUMENTS
       urb
           pointer to URB to be blocked, may be NULL

DESCRIPTION
       After the routine has run, attempts to resubmit the URB will fail with error -EPERM. Thus
       even if the URB's completion handler always tries to resubmit, it will not succeed and the
       URB will become idle.

       The URB must not be deallocated while this routine is running. In particular, when a
       driver calls this routine, it must insure that the completion handler cannot deallocate
       the URB.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                          USB_BLOCK_URB(9)