Bapiraju Alla 549f5cb438 qcacld-3.0: Fix deadlock when SAP interface down during pre_cac failure
While pre cac is in progress and if the SAP is stopped from UI, It may
lead to dead-lock due to rtnl lock. This is because, stopping SAP will
trigger the stop_ap first and then hostapd_stop. Stop_ap will schedule
a work to handle pre_cac failure (Thread1). hostapd_stop will be
triggered in parallel (Thread2). This will result in a below dead-lock
scenario.
   Thread1: Waiting to acquire rtnl_lock to unregister pre_cac adapter.
   Thread2: Acquired the rtnl_lock and waiting for Thread1 to complete

To resolve this dead-lock, unregister pre_cac_adapter during
hostapd_stop without requesting for rtnl_lock.

Change-Id: I222df9ee0d75b16f79c28b7cdd86369c340a15c2
CRs-Fixed: 2832256
2020-12-15 05:49:55 -08:00

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