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 3.10 June 2014 USB_BLOCK_URB(9)
