iwlwifi: enhance WPA authenication stability

This patch enhanced WPA authenication stability by avoiding scan
immediately followed by association. We don't do any scanning right
after association in next several seconds. This will allow WPA
authentication to take place without any interruption.

Signed-off-by: Mohamed Abbas <mabbas@linux.intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index 40c795eaabac..c8e7adfe414a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -3802,6 +3802,8 @@ static void iwl4965_update_ps_mode(struct iwl4965_priv *priv, u16 ps_bit, u8 *ad
         }
 }
 
+#define IWL_DELAY_NEXT_SCAN_AFTER_ASSOC (HZ*6)
+
 /* Called for REPLY_4965_RX (legacy ABG frames), or
  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
 static void iwl4965_rx_reply_rx(struct iwl4965_priv *priv,
@@ -3973,6 +3975,12 @@ static void iwl4965_rx_reply_rx(struct iwl4965_priv *priv,
                                 struct ieee80211_mgmt *mgnt =
                                         (struct ieee80211_mgmt *)header;
 
+                                /* We have just associated, give some
+                                 * time for the 4-way handshake if
+                                 * any. Don't start scan too early. */
+                                priv->next_scan_jiffies = jiffies +
+                                        IWL_DELAY_NEXT_SCAN_AFTER_ASSOC;
+
                                 priv->assoc_id = (~((1 << 15) | (1 << 14))
                                         & le16_to_cpu(mgnt->u.assoc_resp.aid));
                                 priv->assoc_capability =