On Tue, Dec 4, 2012 at 8:12 PM, Marco Porsch
<[email protected]> wrote:
> If the beacon is already enabled, do not modify the beacon timer. This causes
> a hard TBTT adjustment and may cause mischief for powersave or 
> synchronization.j

It might be clearer if you explain this patch actually defers "TBTT"
adjustment until the next beacon.

> Signed-off-by: Marco Porsch <[email protected]>
> ---
>  drivers/net/wireless/mac80211_hwsim.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/mac80211_hwsim.c 
> b/drivers/net/wireless/mac80211_hwsim.c
> index bc763d2..abfa7e6 100644
> --- a/drivers/net/wireless/mac80211_hwsim.c
> +++ b/drivers/net/wireless/mac80211_hwsim.c
> @@ -1174,7 +1174,7 @@ static int mac80211_hwsim_config(struct ieee80211_hw 
> *hw, u32 changed)
>         data->power_level = conf->power_level;
>         if (!data->started || !data->beacon_int)
>                 del_timer(&data->beacon_timer);
> -       else
> +       else if (!timer_pending(&data->beacon_timer))
>                 mod_timer(&data->beacon_timer, jiffies + data->beacon_int);

There is an immediate beacon timer adjustment in
mac80211_hwsim_bss_info_changed() as well.

Thomas
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