From 207a33cf102b8a149a04f0a9a7e296afa7abc26d Mon Sep 17 00:00:00 2001
From: Vinay Krishna Eranna <c_veran@qti.qualcomm.com>
Date: Thu, 27 Mar 2014 10:51:14 -0700
Subject: wlan: Fix for unregistering IPv4 notifier rightly.

Correct the register and unregister sequence of IPv4
notifier block

Change-Id: Icbb9765e6733e5a13922a755b87fe6ceb63240a0
CRs-Fixed: 639818
---
 CORE/HDD/inc/wlan_hdd_main.h          |  1 +
 CORE/HDD/src/wlan_hdd_early_suspend.c | 24 +++++++++++++++++++++---
 CORE/HDD/src/wlan_hdd_main.c          |  8 ++++++++
 3 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index faf1cc094e39..b9f08e4856d2 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -896,6 +896,7 @@ struct hdd_adapter_s
 
    /** IPv4 notifier callback for handling ARP offload on change in IP */
    struct notifier_block ipv4_notifier;
+   bool ipv4_notifier_registered;
    struct work_struct  ipv4NotifierWorkQueue;
 
    //TODO Move this to sta Ctx
diff --git a/CORE/HDD/src/wlan_hdd_early_suspend.c b/CORE/HDD/src/wlan_hdd_early_suspend.c
index a27f10693385..82252cda3337 100644
--- a/CORE/HDD/src/wlan_hdd_early_suspend.c
+++ b/CORE/HDD/src/wlan_hdd_early_suspend.c
@@ -749,9 +749,17 @@ static int wlan_hdd_ipv4_changed(struct notifier_block *nb,
     struct net_device *ndev = ifa->ifa_dev->dev;
     hdd_adapter_t *pAdapter =
              container_of(nb, struct hdd_adapter_s, ipv4_notifier);
-
+    hdd_context_t *pHddCtx;
+    int status;
     if (pAdapter && pAdapter->dev == ndev)
     {
+       pHddCtx = WLAN_HDD_GET_CTX(pAdapter);
+       status = wlan_hdd_validate_context(pHddCtx);
+       if (0 != status)
+       {
+           hddLog(LOGE, FL("HDD context is invalid"));
+           return NOTIFY_DONE;
+       }
        if ((in_dev = __in_dev_get_rtnl(pAdapter->dev)) != NULL)
        {
            for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
@@ -860,7 +868,7 @@ VOS_STATUS hdd_conf_arp_offload(hdd_adapter_t *pAdapter, int fenable)
            hddLog(VOS_TRACE_LEVEL_INFO, FL("IP Address is not assigned\n"));
        }
 
-       if (fenable == 1)
+       if (fenable == 1 && !pAdapter->ipv4_notifier_registered)
        {
            // Register IPv4 notifier to notify if any change in IP
            // So that we can reconfigure the offload parameters
@@ -871,12 +879,22 @@ VOS_STATUS hdd_conf_arp_offload(hdd_adapter_t *pAdapter, int fenable)
            {
                hddLog(LOGE, FL("Failed to register IPv4 notifier"));
            }
+           else
+           {
+               hddLog(LOG1, FL("Registered IPv4 notifier"));
+               pAdapter->ipv4_notifier_registered = true;
+           }
        }
        return VOS_STATUS_SUCCESS;
    }
    else
    {
-       unregister_inetaddr_notifier(&pAdapter->ipv4_notifier);
+       if (pAdapter->ipv4_notifier_registered)
+       {
+            hddLog(LOG1, FL("Unregistered IPv4 notifier"));
+            unregister_inetaddr_notifier(&pAdapter->ipv4_notifier);
+            pAdapter->ipv4_notifier_registered = false;
+       }
        vos_mem_zero((void *)&offLoadRequest, sizeof(tSirHostOffloadReq));
        offLoadRequest.enableOrDisable = SIR_OFFLOAD_DISABLE;
        offLoadRequest.offloadType =  SIR_IPV4_ARP_REPLY_OFFLOAD;
diff --git a/CORE/HDD/src/wlan_hdd_main.c b/CORE/HDD/src/wlan_hdd_main.c
index 8d433693b23d..6ee97015557c 100644
--- a/CORE/HDD/src/wlan_hdd_main.c
+++ b/CORE/HDD/src/wlan_hdd_main.c
@@ -83,6 +83,8 @@
 
 #include <linux/wireless.h>
 #include <net/cfg80211.h>
+#include <linux/inetdevice.h>
+#include <net/addrconf.h>
 #include "wlan_hdd_cfg80211.h"
 #include "wlan_hdd_p2p.h"
 #include <linux/rtnetlink.h>
@@ -8195,6 +8197,12 @@ VOS_STATUS hdd_stop_adapter( hdd_context_t *pHddCtx, hdd_adapter_t *pAdapter )
             }
          }
 
+         if (pAdapter->ipv4_notifier_registered)
+         {
+             hddLog(LOG1, FL("Unregistered IPv4 notifier"));
+             unregister_inetaddr_notifier(&pAdapter->ipv4_notifier);
+             pAdapter->ipv4_notifier_registered = false;
+         }
 #ifdef WLAN_OPEN_SOURCE
          cancel_work_sync(&pAdapter->ipv4NotifierWorkQueue);
 #endif
-- 
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