b43: fix frequency reported on G-PHY with /new/ firmware

Support for firmware rev 508+ was added years ago, but we never noticed
it reports channel in a different way for G-PHY devices. Instead of
offset from 2400 MHz it simply passes channel id (AKA hw_value).

So far it was (most probably) affecting monitor mode users only, but
the following recent commit made it noticeable for quite everybody:

commit 3afc2167f60a327a2c1e1e2600ef209a3c2b75b7
Author: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date:   Tue Mar 4 16:50:13 2014 +0200

    cfg80211/mac80211: ignore signal if the frame was heard on wrong channel

Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Cc: stable@vger.kernel.org
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/net/wireless/b43/xmit.c b/drivers/net/wireless/b43/xmit.c
index 4f38f19b8e3d..6e6ef3fc2247 100644
--- a/drivers/net/wireless/b43/xmit.c
+++ b/drivers/net/wireless/b43/xmit.c
@@ -811,9 +811,13 @@ void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
                 break;
         case B43_PHYTYPE_G:
                 status.band = IEEE80211_BAND_2GHZ;
-                /* chanid is the radio channel cookie value as used
-                 * to tune the radio. */
-                status.freq = chanid + 2400;
+                /* Somewhere between 478.104 and 508.1084 firmware for G-PHY
+                 * has been modified to be compatible with N-PHY and others.
+                 */
+                if (dev->fw.rev >= 508)
+                        status.freq = ieee80211_channel_to_frequency(chanid, status.band);
+                else
+                        status.freq = chanid + 2400;
                 break;
         case B43_PHYTYPE_N:
         case B43_PHYTYPE_LP: