[ 3.5.y.z extended stable ] Patch "rt2800: validate step value for temperature compensation" has been added to staging queue

[Herton Ronaldo Krzesinski]

This is a note to let you know that I have just added a patch titled

    rt2800: validate step value for temperature compensation

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From ed3f47909659b8d2b88c01b3a722d5a5889b1300 Mon Sep 17 00:00:00 2001
From: Stanislaw Gruszka <sgruszka at redhat.com>
Date: Thu, 25 Oct 2012 09:51:39 +0200
Subject: [PATCH] rt2800: validate step value for temperature compensation
X-Extended-Stable: 3.5

commit bf7e1abe434ba9e22e8dc04a4cba4ab504b788b8 upstream.

Some hardware has correct (!= 0xff) value of tssi_bounds[4] in the
EEPROM, but step is equal to 0xff. This results on ridiculous delta
calculations and completely broke TX power settings.

Reported-and-tested-by: Pavel Lucik <pavel.lucik at gmail.com>
Signed-off-by: Stanislaw Gruszka <sgruszka at redhat.com>
Acked-by: Ivo van Doorn <IvDoorn at gmail.com>
Signed-off-by: John W. Linville <linville at tuxdriver.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 drivers/net/wireless/rt2x00/rt2800lib.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index dfc90d3..a15bf1c 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -2255,7 +2255,7 @@ static int rt2800_get_gain_calibration_delta(struct rt2x00_dev *rt2x00dev)
 	/*
 	 * Check if temperature compensation is supported.
 	 */
-	if (tssi_bounds[4] == 0xff)
+	if (tssi_bounds[4] == 0xff || step == 0xff)
 		return 0;

 	/*
--
1.7.9.5