iwlwifi: re-introduce per device debugging

Commit "iwlwifi: make debug level more user friendly" cleaned up the
debug level handling. In doing so it created a single global debug
level for all devices. Some setups do consits of more that one iwlwifi
device and in these setups there is a requirement that debug levels
should be unique per device.

We now re-introduce the per device debugging while maintaining the
cleanup effort of the previous patch.

The maintain the global debug level and now introduce a per-device debug
level that will be used if it (the per-device debug level) is set. The
per-device debug level can be controlled via the debug_level sysfs file
while the global debug level is controlled by the debug module parameter.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index e1b0ef3..7ad02074 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -502,14 +502,14 @@
 		}
 	}
 	if (print_dump)
-		iwl_print_hex_dump(IWL_DL_RX, data, length);
+		iwl_print_hex_dump(priv, IWL_DL_RX, data, length);
 }
 
 static void iwl3945_dbg_report_frame(struct iwl_priv *priv,
 		      struct iwl_rx_packet *pkt,
 		      struct ieee80211_hdr *header, int group100)
 {
-	if (iwl_debug_level & IWL_DL_RX)
+	if (iwl_get_debug_level(priv) & IWL_DL_RX)
 		_iwl3945_dbg_report_frame(priv, pkt, header, group100);
 }