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https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
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b79fd0c6ec
scenario: (1) thread A is doing hdd_stop_adapter() and the caller outside of hdd_stop_adapter will acquire the rtnl lock, dp_vdev_detach_wifi3() in hdd_stop_adpater() will notify DP thread B flush stack GRO frames and wait DP thread B response/set vdev delete event. (2) but if DP thread B is under processing RX frames and do local ARP check for ARP request, it will wait and try to acquire rtnl lock as well, dead lock happened. Until thread A wait vdev delete event timeout and corressponding net_dev/hdd_adapter is freed, then DP thread B get chance to acquire rtnl lock but hdd_adapter/net_dev has been freed, hit panic. Use rtnl_trylock() instead of rtnl_lock() in hdd_is_arp_local(), if rtnl_trylock() failed, assume this is local ARP and return, else do the local ARP checking same as before. Change-Id: Ic6724b68f6e09e9d139c430396e4c76bf483d033 CRs-Fixed: 2760979 |
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This is CNSS WLAN Host Driver for products starting from iHelium