cfg80211: fix antenna gain handling

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@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 498c760a1d2aea75900f56392948980aaeb9a1d9..12c80ccecb2ccc9ed8e4d8bb6cd7089ef1e44f0a 100644 (file)
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -544,8 +544,7 @@ int wiphy_register(struct wiphy *wiphy)
                for (i = 0; i < sband->n_channels; i++) {
                        sband->channels[i].orig_flags =
                                sband->channels[i].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].max_power;
                        sband->channels[i].band = band;