linux-kernel - [PATCH 4/7] drivers/net/wireless/ipw2100.c: Release mutex in error handling code

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Date:	Mon, 21 Jul 2008 09:58:11 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	yi.zhu@...el.com, jketreno@...ux.intel.com,
	reinette.chatre@...el.com, linux-wireless@...r.kernel.org,
	ipw2100-devel@...ts.sourceforge.net, jgarzik@...ox.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 4/7] drivers/net/wireless/ipw2100.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/ipw2100.c b/drivers/net/wireless/ipw2100.c
--- a/drivers/net/wireless/ipw2100.c
+++ b/drivers/net/wireless/ipw2100.c
@@ -6442,6 +6442,7 @@ static int ipw2100_resume(struct pci_dev
 	if (err) {
 		printk(KERN_ERR "%s: pci_enable_device failed on resume\n",
 		       dev->name);
+		mutex_unlock(&priv->action_mutex);
 		return err;
 	}
 	pci_restore_state(pci_dev);
@@ -7146,7 +7147,7 @@ static int ipw2100_wx_get_rate(struct ne
 	err = ipw2100_get_ordinal(priv, IPW_ORD_CURRENT_TX_RATE, &val, &len);
 	if (err) {
 		IPW_DEBUG_WX("failed querying ordinals.\n");
-		return err;
+		goto done;
 	}
 
 	switch (val & TX_RATE_MASK) {
--
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