Re: [PATCH] mac80211: fix PS vs. scan race

[Johannes Berg <johannes@sipsolutions.net>]

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On Wed, 2009-04-22 at 23:02 +0200, Johannes Berg wrote:
> When somebody changes the PS parameters while scanning
> is in progress, we enable PS -- during the scan. This
> is clearly not desirable, and we can just abort enabling
> PS when scanning since when the scan finishes it will
> be taken care of.

John, did this fall through the cracks? I see you included a patch from
today but not this :)

johannes

> Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
> ---
>  net/mac80211/mlme.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> --- wireless-testing.orig/net/mac80211/mlme.c	2009-04-22 22:57:45.000000000 +0200
> +++ wireless-testing/net/mac80211/mlme.c	2009-04-22 22:58:56.000000000 +0200
> @@ -487,6 +487,13 @@ static void ieee80211_enable_ps(struct i
>  {
>  	struct ieee80211_conf *conf = &local->hw.conf;
>  
> +	/*
> +	 * If we are scanning right now then the parameters will
> +	 * take effect when scan finishes.
> +	 */
> +	if (local->hw_scanning || local->sw_scanning)
> +		return;
> +
>  	if (conf->dynamic_ps_timeout > 0 &&
>  	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
>  		mod_timer(&local->dynamic_ps_timer, jiffies +
> 
> 
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