Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-calib.c

diff --git a/drivers/net/wireless/iwlwifi/iwl-calib.c b/drivers/net/wireless/iwlwifi/iwl-calib.c
index 0471c3f8713ec9a79629a288cd73f9519ca6c4a1..f1fd00b1a65da016521ab02a9f89d5de012942f1 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-calib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-calib.c
@@ -808,6 +808,18 @@ void iwl_chain_noise_calibration(struct iwl_priv *priv,
                }
        }
 
+       /*
+        * The above algorithm sometimes fails when the ucode
+        * reports 0 for all chains. It's not clear why that
+        * happens to start with, but it is then causing trouble
+        * because this can make us enable more chains than the
+        * hardware really has.
+        *
+        * To be safe, simply mask out any chains that we know
+        * are not on the device.
+        */
+       active_chains &= priv->hw_params.valid_rx_ant;
+
        num_tx_chains = 0;
        for (i = 0; i < NUM_RX_CHAINS; i++) {
                /* loops on all the bits of