From 56405e091963c8b2dc9d71aa624e33c582102949 Mon Sep 17 00:00:00 2001
From: aiju <devnull@localhost>
Date: Wed, 7 Mar 2018 08:45:06 +0000
Subject: usbehci: catch interrupt in tsleep

---
 sys/src/9/port/usbehci.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/src/9/port/usbehci.c b/sys/src/9/port/usbehci.c
index a8120a516..6a9a7c031 100644
--- a/sys/src/9/port/usbehci.c
+++ b/sys/src/9/port/usbehci.c
@@ -3063,7 +3063,10 @@ cancelisoio(Ctlr *ctlr, Isoio *iso, ulong load)
 	 */
 	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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