linux-kernel - [PATCH 2/2] ath5k: don't change mac in eeprom_read

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Message-Id: <1236418002-2189-2-git-send-email-jirislaby@gmail.com>
Date:	Sat,  7 Mar 2009 10:26:42 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	linux-wireless@...r.kernel.org, ath5k-devel@...ema.h4ckr.net,
	linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...il.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	Bob Copeland <me@...copeland.com>
Subject: [PATCH 2/2] ath5k: don't change mac in eeprom_read_mac on error

Do not touch mac parameter passed to ath5k_eeprom_read_mac unless
we are sure we have correct address. I.e. when returning error, do
not change it.

While at it, use '= {}' compiler trick for memsetting mac_d.

Signed-off-by: Jiri Slaby <jirislaby@...il.com>
Cc: Nick Kossifidis <jirislaby@...il.com>
Cc: Luis R. Rodriguez <lrodriguez@...eros.com>
Cc: Bob Copeland <me@...copeland.com>
---
 drivers/net/wireless/ath5k/eeprom.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/ath5k/eeprom.c b/drivers/net/wireless/ath5k/eeprom.c
index a54ee7e..ac45ca4 100644
--- a/drivers/net/wireless/ath5k/eeprom.c
+++ b/drivers/net/wireless/ath5k/eeprom.c
@@ -1418,14 +1418,11 @@ ath5k_eeprom_init(struct ath5k_hw *ah)
  */
 int ath5k_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
 {
-	u8 mac_d[ETH_ALEN];
+	u8 mac_d[ETH_ALEN] = {};
 	u32 total, offset;
 	u16 data;
 	int octet, ret;
 
-	memset(mac, 0, ETH_ALEN);
-	memset(mac_d, 0, ETH_ALEN);
-
 	ret = ath5k_hw_eeprom_read(ah, 0x20, &data);
 	if (ret)
 		return ret;
@@ -1441,11 +1438,11 @@ int ath5k_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
 		octet += 2;
 	}
 
-	memcpy(mac, mac_d, ETH_ALEN);
-
 	if (!total || total == 3 * 0xffff)
 		return -EINVAL;
 
+	memcpy(mac, mac_d, ETH_ALEN);
+
 	return 0;
 }
 
-- 
1.6.1.3

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