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Reporting a completion via usb_complete() will pass control outside the scope of xhci.c, and could potentially result in a further call to xhci_event_poll() before returning from usb_complete(). Since we currently update the event consumer counter only after calling usb_complete(), this can result in duplicate completions and consequent corruption of the submission TRB ring structures. Fix by updating the event ring consumer counter before passing control to usb_complete(). Reported-by: Andreas Hammarskjöld <junior@2PintSoftware.com> Tested-by: Andreas Hammarskjöld <junior@2PintSoftware.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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