iwl4965: reset firmware after rfkill off

commit 788f7a56 upstream.

Using rfkill switch can make firmware unstable, what cause various
Microcode errors and kernel warnings. Reseting firmware just after
rfkill off (radio on) helped with that.

Resolve:
https://bugzilla.redhat.com/show_bug.cgi?id=977053Reported-and-tested-by: Justin Pearce <whitefox@guardianfox.net>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
[bwh: Backported to 3.2: adjust filenames, context, naming]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/net/wireless/iwlegacy/iwl-core.c

@@ -1757,6 +1757,7 @@ int iwl_legacy_force_reset(struct iwl_priv *priv, bool external)
 
 	return 0;
 }
+EXPORT_SYMBOL(iwl_legacy_force_reset);
 
 int
 iwl_legacy_mac_change_interface(struct ieee80211_hw *hw,

drivers/net/wireless/iwlegacy/iwl4965-base.c

@@ -868,12 +868,12 @@ static void iwl4965_irq_tasklet(struct iwl_priv *priv)
 		 * is killed. Hence update the killswitch state here. The
 		 * rfkill handler will care about restarting if needed.
 		 */
-		if (!test_bit(STATUS_ALIVE, &priv->status)) {
-			if (hw_rf_kill)
-				set_bit(STATUS_RF_KILL_HW, &priv->status);
-			else
-				clear_bit(STATUS_RF_KILL_HW, &priv->status);
+		if (hw_rf_kill) {
+			set_bit(STATUS_RF_KILL_HW, &priv->status);
+		} else {
+			clear_bit(STATUS_RF_KILL_HW, &priv->status);
 			wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rf_kill);
+			iwl_legacy_force_reset(priv, true);
 		}
 
 		handled |= CSR_INT_BIT_RF_KILL;