Patchwork [028/241] rt2800: validate step value for temperature compensation

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Submitter Herton Ronaldo Krzesinski
Date Dec. 13, 2012, 1:56 p.m.
Message ID <1355407206-17100-29-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/205878/
State New
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Herton Ronaldo Krzesinski - Dec. 13, 2012, 1:56 p.m.
3.5.7.2 -stable review patch.  If anyone has any objections, please let me know.

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

From: Stanislaw Gruszka <sgruszka@redhat.com>

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

Patch

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;
 
 	/*