linux-kernel - [PATCH] [RFC] staging: rtl8821ae: fix invalid bit mask on MSR

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Date:	Fri, 14 Feb 2014 22:50:23 +0100
From:	Levente Kurusa <levex@...ux.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	OSUOSL Drivers <devel@...verdev.osuosl.org>
Cc:	Levente Kurusa <levex@...ux.com>
Subject: [PATCH] [RFC] staging: rtl8821ae: fix invalid bit mask on MSR_AP check

Since MSR_AP is 0x3, ANDing it with 0xFC will never be true.
Add a NOT operation to 0xFC so that we will AND with the last
three bits which will result in a possibility that the condition
will succeed.

Signed-off-by: Levente Kurusa <levex@...ux.com>
---
 Hi,

 This might not be the real solution since it is also possible that
 the particular condition never really happens. I seek comments
 so that I can post the proper patch.

 Thanks!
 
 drivers/staging/rtl8821ae/rtl8821ae/hw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8821ae/rtl8821ae/hw.c b/drivers/staging/rtl8821ae/rtl8821ae/hw.c
index 5ed7a11..f204b31 100644
--- a/drivers/staging/rtl8821ae/rtl8821ae/hw.c
+++ b/drivers/staging/rtl8821ae/rtl8821ae/hw.c
@@ -1622,7 +1622,7 @@ static int _rtl8821ae_set_media_status(struct ieee80211_hw *hw,
 
 	rtl_write_byte(rtlpriv, (MSR), bt_msr);
 	rtlpriv->cfg->ops->led_control(hw, ledaction);
-	if ((bt_msr & 0xfc) == MSR_AP)
+	if ((bt_msr & ~0xfc) == MSR_AP)
 		rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x00);
 	else
 		rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x66);
-- 
1.7.9.5

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