[AX.25]: Optimize AX.25 socket list lock

Right now all uses of the ax25_list_lock lock are _bh locks but knowing
some code is only ever getting invoked from _bh context we can better.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ax25/ax25_ds_timer.c b/net/ax25/ax25_ds_timer.c
index 5961459..4f44185 100644
--- a/net/ax25/ax25_ds_timer.c
+++ b/net/ax25/ax25_ds_timer.c
@@ -85,7 +85,7 @@
 		return;
 	}
 
-	spin_lock_bh(&ax25_list_lock);
+	spin_lock(&ax25_list_lock);
 	ax25_for_each(ax25, node, &ax25_list) {
 		if (ax25->ax25_dev != ax25_dev || !(ax25->condition & AX25_COND_DAMA_MODE))
 			continue;
@@ -93,7 +93,7 @@
 		ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
 		ax25_disconnect(ax25, ETIMEDOUT);
 	}
-	spin_unlock_bh(&ax25_list_lock);
+	spin_unlock(&ax25_list_lock);
 
 	ax25_dev_dama_off(ax25_dev);
 }