| ieee80211_sta_block_awake(9) - phpMan
IEEE80211_STA_BLOCK_(9) Advanced driver interface IEEE80211_STA_BLOCK_(9)
NAME
ieee80211_sta_block_awake - block station from waking up
SYNOPSIS
void ieee80211_sta_block_awake(struct ieee80211_hw * hw, struct ieee80211_sta * pubsta,
bool block);
ARGUMENTS
hw
the hardware
pubsta
the station
block
whether to block or unblock
DESCRIPTION
Some devices require that all frames that are on the queues for a specific station that
went to sleep are flushed before a poll response or frames after the station woke up can
be delivered to that it. Note that such frames must be rejected by the driver as filtered,
with the appropriate status flag.
This function allows implementing this mode in a race-free manner.
To do this, a driver must keep track of the number of frames still enqueued for a specific
station. If this number is not zero when the station goes to sleep, the driver must call
this function to force mac80211 to consider the station to be asleep regardless of the
station's actual state. Once the number of outstanding frames reaches zero, the driver
must call this function again to unblock the station. That will cause mac80211 to be able
to send ps-poll responses, and if the station queried in the meantime then frames will
also be sent out as a result of this. Additionally, the driver will be notified that the
station woke up some time after it is unblocked, regardless of whether the station
actually woke up while blocked or not.
AUTHOR
Johannes Berg <johannes AT sipsolutions.net>
Author.
COPYRIGHT
Kernel Hackers Manual 4.8. January 2017 IEEE80211_STA_BLOCK_(9)
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