linux-kernel - [PATCH 4.2 015/134] rtlwifi: rtl8821ae: Fix an expression that is always false

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Message-Id: <20150926205312.717808829@linuxfoundation.org>
Date:	Sat, 26 Sep 2015 13:54:27 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, David Binderman <dcb314@...mail.com>,
	Larry Finger <Larry.Finger@...inger.net>,
	Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.2 015/134] rtlwifi: rtl8821ae: Fix an expression that is always false

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Larry Finger <Larry.Finger@...inger.net>

commit 251086f588720277a6f5782020a648ce32c4e00b upstream.

In routine _rtl8821ae_set_media_status(), an incorrect mask results in a test
for AP status to always be false. Similar bugs were fixed in rtl8192cu and
rtl8192de, but this instance was missed at that time.

Reported-by: David Binderman <dcb314@...mail.com>
Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Cc: David Binderman <dcb314@...mail.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/rtlwifi/rtl8821ae/hw.c  |    2 +-
 drivers/net/wireless/rtlwifi/rtl8821ae/reg.h |    1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/rtlwifi/rtl8821ae/hw.c
+++ b/drivers/net/wireless/rtlwifi/rtl8821ae/hw.c
@@ -2180,7 +2180,7 @@ static int _rtl8821ae_set_media_status(s
 
 	rtl_write_byte(rtlpriv, MSR, bt_msr);
 	rtlpriv->cfg->ops->led_control(hw, ledaction);
-	if ((bt_msr & 0xfc) == MSR_AP)
+	if ((bt_msr & MSR_MASK) == MSR_AP)
 		rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x00);
 	else
 		rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x66);
--- a/drivers/net/wireless/rtlwifi/rtl8821ae/reg.h
+++ b/drivers/net/wireless/rtlwifi/rtl8821ae/reg.h
@@ -429,6 +429,7 @@
 #define	MSR_ADHOC				0x01
 #define	MSR_INFRA				0x02
 #define	MSR_AP					0x03
+#define MSR_MASK				0x03
 
 #define	RRSR_RSC_OFFSET				21
 #define	RRSR_SHORT_OFFSET			23


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