[PATCH 002/241] cfg80211: fix antenna gain handling

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Thu Dec 13 13:56:07 UTC 2012 -stable review patch.  If anyone has any objections, please let me know.


From: Felix Fietkau <nbd at openwrt.org>

commit c4a9fafc77a5318f5ed26c509bbcddf03e18c201 upstream.

No driver initializes chan->max_antenna_gain to something sensible, and
the only place where it is being used right now is inside ath9k. This
leads to ath9k potentially using less tx power than it can use, which can
decrease performance/range in some rare cases.

Rather than going through every single driver, this patch initializes
chan->orig_mag in wiphy_register(), ignoring whatever value the driver
left in there. If a driver for some reason wishes to limit it independent
from regulatory rulesets, it can do so internally.

Signed-off-by: Felix Fietkau <nbd at openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
 net/wireless/core.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/wireless/core.c b/net/wireless/core.c
index e98ab2f..3f514b6 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -548,8 +548,7 @@ int wiphy_register(struct wiphy *wiphy)
 		for (i = 0; i < sband->n_channels; i++) {
 			sband->channels[i].orig_flags =
-			sband->channels[i].orig_mag =
-				sband->channels[i].max_antenna_gain;
+			sband->channels[i].orig_mag = INT_MAX;
 			sband->channels[i].orig_mpwr =
 			sband->channels[i].band = band;

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