linux-kernel - [PATCH] drivers/atm/atmtcp.c: add missing atm_dev

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Message-ID: <Pine.LNX.4.64.1012291500310.8559@pc-004.diku.dk>
Date:	Wed, 29 Dec 2010 15:01:03 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Chas Williams <chas@....nrl.navy.mil>,
	linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] drivers/atm/atmtcp.c: add missing atm_dev_put

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

The earlier call to atm_dev_lookup increases the reference count of dev,
so decrease it on the way out.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x, E;
constant C;
@@

x = atm_dev_lookup(...);
... when != false x != NULL
    when != true x == NULL
    when != \(E = x\|x = E\)
    when != atm_dev_put(dev);
*return -C;
// </smpl>

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

---
 drivers/atm/atmtcp.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/atm/atmtcp.c b/drivers/atm/atmtcp.c
index 2b464b6..0b06250 100644
--- a/drivers/atm/atmtcp.c
+++ b/drivers/atm/atmtcp.c
@@ -392,7 +392,10 @@ static int atmtcp_attach(struct atm_vcc *vcc,int itf)
 			atm_dev_put(dev);
 			return -EMEDIUMTYPE;
 		}
-		if (PRIV(dev)->vcc) return -EBUSY;
+		if (PRIV(dev)->vcc) {
+			atm_dev_put(dev);
+			return -EBUSY;
+		}
 	}
 	else {
 		int error;
--
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