linux-kernel - [ 17/68] b43: N-PHY: use more bits for offset in RSSI calibration

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Date:	Tue,  2 Apr 2013 15:13:06 -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,
	Rafał Miłecki <zajec5@...il.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 17/68] b43: N-PHY: use more bits for offset in RSSI calibration

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

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

From: Rafał Miłecki <zajec5@...il.com>

commit 2e1253d640eb7f8707d2591c93097c1e9f9c71d5 upstream.

When calculating "offset" for final RSSI calibration we're using numbers
bigger than s8 can hold. We have for example:
offset[j] = 232 - poll_results[j];
formula. If poll_results[j] is small enough (it usually is) we treat
number's bit as a sign bit. For example 232 - 1 becomes:
0xE8 - 0x1 = 0xE7, which is not 231 but -25.

This code was introduced in e0c9a0219a8f542e3946fe972a68aacf8c3f906c
and caused stability regression on some cards, for ex. BCM4322.

Signed-off-by: Rafał Miłecki <zajec5@...il.com>
Signed-off-by: John W. Linville <linville@...driver.com>

---
 drivers/net/wireless/b43/phy_n.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/b43/phy_n.c
+++ b/drivers/net/wireless/b43/phy_n.c
@@ -1320,7 +1320,7 @@ static void b43_nphy_rev3_rssi_cal(struc
 	u16 clip_off[2] = { 0xFFFF, 0xFFFF };

 	u8 vcm_final = 0;
-	s8 offset[4];
+	s32 offset[4];
 	s32 results[8][4] = { };
 	s32 results_min[4] = { };
 	s32 poll_results[4] = { };
@@ -1487,7 +1487,7 @@ static void b43_nphy_rev2_rssi_cal(struc
 	u8 regs_save_radio[2];
 	u16 regs_save_phy[2];

-	s8 offset[4];
+	s32 offset[4];
 	u8 core;
 	u8 rail;

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