hi,
i am new to the linux system and i am hoping that this is the right
list to mail for my query.
I am presently working on linux kernel 3.1.4 and i was looking into the
mac80211 code and the scan implementation on the same.
when the scan process is started, the station is supposed to send a
null frame with PM bit set, so that AP can buffer frames to the station.
However, it is seen in code that when scan is initiated (software
scan),
the ieee80211_offchannel_enable_all_ps(local, false); function is
called, since the flag is set to false, the NULL frame will not be sent
out. also, when the scan state changes to leaving operating channel, the
vifs interface is blocked. even here, i see that the flag setting is
false for offchannel Power save and the null frame is not sent out.
the comment however just prior to the vifs stop function call indicates
that offchannel settings are already completed at the start of scan
process. the code snippet is shown below:
/*PS will already be in off-channel mode, we do that once at the
beginning of scanning.*/
ieee80211_offchannel_stop_vifs(local, false);
i just would like to know why the flag is FALSE in both cases, so we
never send out a null frame to the AP at the start. is this a bug or
there is some deficiency in my current understanding?
i would be very thankful for any help or guidance
thanks in advance
vivek
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