cc1d054d9c
transfer, which lead to panics or page faults. For example if a transfer timed out, another thread could come along and attempt to abort the same transfer while the timeout task was sleeping in the *_abort_xfer() function. Add an "aborting" flag to the private transfer state in each host controller driver and use this to ensure that the abort is only executed once. Also prioritise normal abort requests over timeouts so that the callback is always given a status of USB_CANCELLED even if the timeout-initiated abort began first. The crashes caused by this bug were mainly reported in connection with lpd printing to a USB printer. PR: usb/78208, usb/78986
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