linux-kernel - [PATCH 3/7] drivers/net/wireless/b43legacy/main.c: Release mutex in error handling code

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Message-ID: <Pine.LNX.4.64.0807210957270.24625@ask.diku.dk>
Date:	Mon, 21 Jul 2008 09:57:47 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Larry.Finger@...inger.net, stefano.brivio@...imi.it,
	linux-wireless@...r.kernel.org, jgarzik@...ox.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 3/7] drivers/net/wireless/b43legacy/main.c: Release mutex in
 error handling code

From: Julia Lawall <julia@...u.dk>

The mutex is released on a successful return, so it would seem that it
should be released on an error return as well.

The semantic patch finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression l;
@@

mutex_lock(l);
... when != mutex_unlock(l)
    when any
    when strict
(
if (...) { ... when != mutex_unlock(l)
+   mutex_unlock(l);
    return ...;
}
|
mutex_unlock(l);
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
diff -u -p a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -3862,10 +3862,10 @@ static int b43legacy_resume(struct ssb_d
 			goto out;
 		}
 	}
-	mutex_unlock(&wl->mutex);
 
 	b43legacydbg(wl, "Device resumed.\n");
 out:
+	mutex_unlock(&wl->mutex);
 	return err;
 }
 
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