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This allows the driver to use PS buffering of Deauthentication and Disassociation frames when the STA is in power save sleep. The STA entry (and PTK) will be removed from the kernel only after the Deauth/Disassoc has been transmitted (e.g., when the STA wakes up). A hardcoded two second timeout is used to limit the length of this window should the driver fail to deliver the frame (e.g., the STA is out of range and does not wake up). The kernel STA entry is marked unauthorized during the wait to avoid accepting Data frames from the STA that we have decided to disconnect. This behavior is available only with drivers that provide TX status events for Deauth/Disassoc frames (nl80211 at this point). Other drivers continue to use the previous behavior where the STA entry is removed immediately.
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