__BLK_END_REQUEST_AL(9) Block Devices __BLK_END_REQUEST_AL(9)NAME
__blk_end_request_all - Helper function for drives to finish the request.
SYNOPSIS
void __blk_end_request_all(struct request * rq, int error);
ARGUMENTS
rq
the request to finish
error
0 for success, < 0 for error
DESCRIPTION
Completely finish rq. Must be called with queue lock held.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 __BLK_END_REQUEST_AL(9)
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USB_KILL_URB(9) USB Core APIs USB_KILL_URB(9)NAME
usb_kill_urb - cancel a transfer request and wait for it to finish
SYNOPSIS
void usb_kill_urb(struct urb * urb);
ARGUMENTS
urb
pointer to URB describing a previously submitted request, may be NULL
DESCRIPTION
This routine cancels an in-progress request. It is guaranteed that upon return all completion handlers will have finished and the URB will
be totally idle and available for reuse. These features make this an ideal way to stop I/O in a disconnect callback or close function. If
the request has not already finished or been unlinked the completion handler will see urb->status == -ENOENT.
While the routine is running, 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.
This routine may not be used in an interrupt context (such as a bottom half or a completion handler), or when holding a spinlock, or in
other situations where the caller can't schedule.
This routine should not be called by a driver after its disconnect method has returned.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_KILL_URB(9)