From a877d4a4e98422694dc99271f12b2cc75cf42f45 Mon Sep 17 00:00:00 2001
From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Mon, 4 Apr 2005 17:37:35 +0000
Subject: [PATCH] Don't leak mutex on open failure.

---
 sys/dev/ieee488/upd7210.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/dev/ieee488/upd7210.c b/sys/dev/ieee488/upd7210.c
index d952bc2fa73..e4b50ace490 100644
--- a/sys/dev/ieee488/upd7210.c
+++ b/sys/dev/ieee488/upd7210.c
@@ -177,8 +177,10 @@ gpib_l_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
 	u = dev->si_drv1;
 
 	mtx_lock(&u->mutex);
-	if (u->busy)
+	if (u->busy) {
+		mtx_unlock(&u->mutex);
 		return (EBUSY);
+	}
 	u->busy = 1;
 	u->irq = gpib_l_irq;
 	mtx_unlock(&u->mutex);