USB_HCD_UNLINK_URB_F(9) Host Controller APIs USB_HCD_UNLINK_URB_F(9)NAME
usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
void usb_hcd_unlink_urb_from_ep(struct usb_hcd * hcd, struct urb * urb);
host controller to which urb was submitted
URB being unlinked
Host controller drivers should call this routine before calling usb_hcd_giveback_urb. The HCD's private spinlock must be held and
interrupts must be disabled. The actions carried out here are required for URB completion.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_HCD_UNLINK_URB_F(9)
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USB_POISON_URB(9) USB Core APIs USB_POISON_URB(9)NAME
usb_poison_urb - reliably kill a transfer and prevent further use of an URB
void usb_poison_urb(struct urb * urb);
pointer to URB describing a previously submitted request, may be NULL
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 cannot be reused. These features make this an ideal way to stop I/O in a disconnect callback. If the request has not
already finished or been unlinked the completion handler will see urb->status == -ENOENT.
After and while the routine runs, 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_POISON_URB(9)
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