Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6

[pandora-kernel.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 845831a..8b516c5 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-calib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-calib.c
@@ -60,6 +60,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#include <linux/slab.h>
 #include <net/mac80211.h>
 
 #include "iwl-dev.h"
@@ -807,6 +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