On 2019-02-28 09:03, Stanislaw Gruszka wrote:
> set_tim callback is not used by mac80211 if AP_LINK_PS hw flag is set.
> 
> Signed-off-by: Stanislaw Gruszka <[email protected]>

There's a check in __sta_info_recalc_tim:

    /* No need to do anything if the driver does all */
    if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
        return;

At the moment we need this dummy callback to ensure that the 
beacon TIM bits are set. 

- Felix 

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