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usbehci: release ctlr ilock before calling pollcheck()

--- a/sys/src/9/port/usbehci.c

+++ b/sys/src/9/port/usbehci.c

@@ -2327,9 +2327,11 @@

 	if(qh->state == Qrun){

 		ctlrinterrupt(ctlr);

 		if(qh->state == Qdone){

+			iunlock(ctlr);

 			dqprint("ehci %#p: polling required\n", ctlr->capio);

 			ctlr->poll.must = 1;

 			pollcheck(hp);

+			ilock(ctlr);

 		}

 	}