Crash in wcn36xx_dxe_tx_frame

[KrasnikovEugene]

Tried to run iperf full throttle and crash occurred. All logs were disabled.
Iperf line:
iperf -c 192.168.0.199 -u -i5 -t3600 -b70M

Error description:
[ 346.566854] Unable to handle kernel NULL pointer dereference at virtual address 00000050
[ 346.566976] pgd = e1ba8000
[ 346.567037] [00000050] *pgd=a5fde831, *pte=00000000, *ppte=00000000
[ 346.567343] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
[ 346.567404] Modules linked in: wcn36xx(O) mac80211(O) cfg80211(O) compat(O)
[ 346.567800] CPU: 0 Tainted: G W O (3.4.0-g5b052b2-00814-g976ab37-dirty #2)
[ 346.567953] PC is at wcn36xx_dxe_tx_frame+0x298/0x3d4 [wcn36xx]
[ 346.568014] LR is at dma_cache_maint_page+0xfc/0x108

[ 346.618190] [](wcn36xx_dxe_tx_frame+0x298/0x3d4 [wcn36xx]) from [](__ieee80211_tx.isra.6+0x230/0x284 [mac80211])
[ 346.618464] [](__ieee80211_tx.isra.6+0x230/0x284 [mac80211]) from [](ieee80211_tx+0xb8/0xc8 [mac80211])
[ 346.618678] [](ieee80211_tx+0xb8/0xc8 [mac80211]) from [](ieee80211_subif_start_xmit+0x81c/0x84c [mac80211])
[ 346.618861] [](ieee80211_subif_start_xmit+0x81c/0x84c [mac80211]) from
[ 346.618983] from
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[ 346.619563] from
[ 346.619655] from
[ 346.619777] from
[ 346.619899] from
[ 346.620021] from
[ 346.620112] from
[ 346.620234] from
[ 346.620357] from

[KrasnikovEugene]

fixed with 9b58129