iwlwifi: print warning about disconnected antennas

When we detect that not all antennas are
properly connected, we simply disable the
associated chains, but never notify the
user at all. Print out a warning so it is
obvious that happened and we know where
to start looking for related issues.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

drivers/net/wireless/iwlwifi/iwl-calib.c

@@ -846,6 +846,13 @@ void iwl_chain_noise_calibration(struct iwl_priv *priv,
 		}
 	}
 
+	if (active_chains != priv->hw_params.valid_rx_ant &&
+	    active_chains != priv->chain_noise_data.active_chains)
+		IWL_WARN(priv,
+			 "Detected that not all antennas are connected! "
+			 "Connected: %#x, valid: %#x.\n",
+			 active_chains, priv->hw_params.valid_rx_ant);
+
 	/* Save for use within RXON, TX, SCAN commands, etc. */
 	priv->chain_noise_data.active_chains = active_chains;
 	IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",