From 8ecf929944021233a374f77b3d2e44a04286ce8b Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Tue, 4 Jun 2013 00:08:59 +1000
Subject: [PATCH] Check for zero timeout on _usb_write.

---
 usbutils.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/usbutils.c b/usbutils.c
index 0e884d77..257a2cab 100644
--- a/usbutils.c
+++ b/usbutils.c
@@ -2288,6 +2288,8 @@ int _usb_write(struct cgpu_info *cgpu, int ep, char *buf, size_t bufsiz, int *pr
 			break;
 
 		timeout = initial_timeout - (done * 1000);
+		if (!timeout)
+			break;
 	}
 
 	*processed = tot;