iwlagn: refactor up path

Starting the device consists of many things,
refactor out enabling the hardware and also
return -ERFKILL when the rfkill signal is
found to be asserted (which makes more sense
anyway, but is also required now to make the
__iwl_up function return right away.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.h b/drivers/net/wireless/iwlwifi/iwl-agn.h
index 1211f45..ef1bbd4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.h
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.h
@@ -128,7 +128,9 @@
 	tasklet_kill(&priv->irq_tasklet);
 }
 
+int iwl_prepare_card_hw(struct iwl_priv *priv);
 
+int iwlagn_start_device(struct iwl_priv *priv);
 void iwlagn_stop_device(struct iwl_priv *priv);
 
 /* tx queue */