IEEE80211_STA_BLOCK_(9) Advanced driver interface IEEE80211_STA_BLOCK_(9)NAMEieee80211_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@sipsolutions.net>
Author.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 IEEE80211_STA_BLOCK_(9)
