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Re: [PATCH 1/2] mac80211: synchronize scan off/on-channel and PS states

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On Mon, 2013-01-14 at 10:49 -0600, Seth Forshee wrote:
> On Thu, Dec 20, 2012 at 02:41:18PM +0100, Stanislaw Gruszka wrote:
> > Since:
> > 
> > commit b23b025fe246f3acc2988eb6d400df34c27cb8ae
> > Author: Ben Greear <greearb@xxxxxxxxxxxxxxx>
> > Date:   Fri Feb 4 11:54:17 2011 -0800
> > 
> >     mac80211: Optimize scans on current operating channel.
> > 
> > we do not disable PS while going back to operational channel (on
> > ieee80211_scan_state_suspend) and deffer that until scan finish.
> > But since we are allowed to send frames, we can send a frame to AP
> > without PM bit set, so disable PS on AP side. Then when we switch
> > to off-channel (in ieee80211_scan_state_resume) we do not enable PS.
> > Hence we are off-channel with PS disabled, frames are not buffered
> > by AP.
> > 
> > To fix remove offchannel_ps_disable argument and always enable PS when
> > going off-channel and disable it when going on-channel, like it was
> > before.
> > 
> > Cc: stable@xxxxxxxxxxxxxxx # 2.6.39+
> > Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
> 
> This patch makes a huge difference in performance and packet loss during
> software scans in my testing with iperf.
> 
> Tested-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>

Applied, sorry about the delay.

johannes

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