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usb_unanchor_urb(9) [centos man page]

USB_UNANCHOR_URB(9)						   USB Core APIs					       USB_UNANCHOR_URB(9)

NAME
usb_unanchor_urb - unanchors an URB SYNOPSIS
void usb_unanchor_urb(struct urb * urb); ARGUMENTS
urb pointer to the urb to anchor DESCRIPTION
Call this to stop the system keeping track of this URB COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_UNANCHOR_URB(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)
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