eaa33eee78969e868de87d836dfe01652d841d10

qcacld-2.0 to qcacld-3.0 propagation In some case, scan_block_work will be scheduled, but NETDEV_DOWN will come before scan_block_work executed, it will lead to crash. Because in this case it will call ___cfg80211_scan_done to free scan request in cfg80211_netdev_notifier_call firstly, but it will access scan request in wlan_hdd_cfg80211_scan_block_cb afterwards, so it will crash. Add flush scan_block_work process when receive NETDEV_GOING_DOWN notifier. Change-Id: Iada4b907f5fb03871406904340e21b6cdf89306f CRs-Fixed: 2034794
This is CNSS WLAN Host Driver for products starting from iHelium
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