linux-kernel - [PATCH 8/8] drivers/net/wireless/iwlwifi/iwl-agn.c: Fix return value from an unsigned function

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Message-Id: <1283713226-8429-9-git-send-email-julia@diku.dk>
Date:	Sun,  5 Sep 2010 21:00:26 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Reinette Chatre <reinette.chatre@...el.com>
Cc:	kernel-janitors@...r.kernel.org,
	Wey-Yi Guy <wey-yi.w.guy@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 8/8] drivers/net/wireless/iwlwifi/iwl-agn.c: Fix return value from an unsigned function

The function has an unsigned return type, but returns a negative constant
to indicate an error condition.  Another error condition in the same
function is indicated by returning 0, and indeed the only call to the
function checks for 0 to detect errors, so the return of a negative value
it converted to a return of 0.

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

// <smpl>
@exists@
identifier f;
constant C;
@@

 unsigned f(...)
 { <+...
*  return -C;
 ...+> }
// </smpl>

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

---
 drivers/net/wireless/iwlwifi/iwl-agn.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index ad0e67f..86b55c2 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -369,7 +369,7 @@ static unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv,
 
 	if (!priv->beacon_ctx) {
 		IWL_ERR(priv, "trying to build beacon w/o beacon context!\n");
-		return -EINVAL;
+		return 0;
 	}
 
 	/* Initialize memory */

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