mac80211: allow mac80211 drivers to get to struct ieee80211_hw from wiphy

If a driver is given a wiphy and it wants to get to its private
mac80211 driver area it can use wiphy_to_ieee80211_hw() to get first
to its ieee80211_hw and then access the private structure via hw->priv. The
wiphy_priv() is already being used internally by mac80211 and drivers
should not use this. This can be helpful in a drivers reg_notifier().

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index ede96c4fea2e..fc30f2940e1e 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -41,6 +41,15 @@ const unsigned char rfc1042_header[] __aligned(2) =
 const unsigned char bridge_tunnel_header[] __aligned(2) =
         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
 
+struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
+{
+        struct ieee80211_local *local;
+        BUG_ON(!wiphy);
+
+        local = wiphy_priv(wiphy);
+        return &local->hw;
+}
+EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
 
 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
                         enum nl80211_iftype type)