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usbehci: catch interrupt in tsleep

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

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

@@ -3063,7 +3063,10 @@

 	 */

 	wakeup(iso);

 	diprint("cancelisoio iso %#p waiting for I/O to cease\n", iso);

-	tsleep(&up->sleep, return0, 0, 5);

+	if(!waserror()){

+		tsleep(&up->sleep, return0, 0, 5);

+		poperror();

+	}

 	qlock(iso);

 	qunlock(iso);

 	diprint("cancelisoio iso %#p releasing iso\n", iso);

-- 

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