[PATCH 092/118] iwlwifi: dvm: don't send zeroed LQ cmd

[Luis Henriques]

3.5.7.12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Emmanuel Grumbach <emmanuel.grumbach at intel.com>

commit 63b77bf489881747c5118476918cc8c29378ee63 upstream.

When the stations are being restored because of unassoc
RXON, the LQ cmd may not have been initialized because it
is initialized only after association.
Sending zeroed LQ_CMD makes the fw unhappy: it raises
SYSASSERT_2078.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach at intel.com>
Reviewed-by: Johannes Berg <johannes.berg at intel.com>
[move zero_lq and make static const]
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
[ luis: backport to 3.5:
  - file rename: dvm/sta.c -> iwl-agn-sta.c ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/wireless/iwlwifi/iwl-agn-sta.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-sta.c b/drivers/net/wireless/iwlwifi/iwl-agn-sta.c
index 287fdd0..b4f0661 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-sta.c
@@ -723,6 +723,7 @@ void iwl_clear_ucode_stations(struct iwl_priv *priv,
 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 {
 	struct iwl_addsta_cmd sta_cmd;
+	static const struct iwl_link_quality_cmd zero_lq = {};
 	struct iwl_link_quality_cmd lq;
 	int i;
 	bool found = false;
@@ -761,7 +762,9 @@ void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 				else
 					memcpy(&lq, priv->stations[i].lq,
 					       sizeof(struct iwl_link_quality_cmd));
-				send_lq = true;
+
+				if (!memcmp(&lq, &zero_lq, sizeof(lq)))
+					send_lq = true;
 			}
 			spin_unlock_bh(&priv->sta_lock);
 			ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
-- 
1.8.1.2