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, 9 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index 51b90309ce5a..1b81545b94ea 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -285,6 +285,8 @@ static void iwl3945_handle_data_packet(struct iwl3945_priv *priv, int is_data,
         rxb->skb = NULL;
 }
 
+#define IWL_DELAY_NEXT_SCAN_AFTER_ASSOC (HZ*6)
+
 static void iwl3945_rx_reply_rx(struct iwl3945_priv *priv,
                                 struct iwl3945_rx_mem_buffer *rxb)
 {
@@ -442,6 +444,13 @@ static void iwl3945_rx_reply_rx(struct iwl3945_priv *priv,
                 case IEEE80211_STYPE_REASSOC_RESP:{
                                 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));