Date: Thu, 31 Jan 2013 10:33:55 -0600
From: Seth Forshee <seth.forshee@canonical.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: linux-wireless@vger.kernel.org,
	"John W. Linville" <linville@tuxdriver.com>,
	Stanislaw Gruszka <sgruszka@redhat.com>,
	"Luis R. Rodriguez" <mcgrof@qca.qualcomm.com>,
	Jouni Malinen <jouni@qca.qualcomm.com>,
	Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>,
	Senthil Balasubramanian <senthilb@qca.qualcomm.com>,
	Christian Lamparter <chunkeey@googlemail.com>,
	Ivo van Doorn <IvDoorn@gmail.com>,
	Gertjan van Wingerde <gwingerde@gmail.com>,
	Helmut Schaa <helmut.schaa@googlemail.com>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	Chaoming Li <chaoming_li@realsil.com.cn>,
	Arend van Spriel <arend@broadcom.com>,
	Luciano Coelho <coelho@ti.com>, ath9k-devel@venema.h4ckr.net,
	brcm80211-dev-list@broadcom.com, users@rt2x00.serialmonkey.com
Subject: Re: [PATCH 5/7] mac80211: Expand powersave configuration flag to be
 two bits
Message-ID: <20130131163355.GE28799@thinkpad-t410> (sfid-20130131_173409_442101_3890706A)
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 <1359645648.8415.77.camel@jlt4.sipsolutions.net>
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On Thu, Jan 31, 2013 at 04:20:48PM +0100, Johannes Berg wrote:
> On Tue, 2013-01-29 at 17:47 -0600, Seth Forshee wrote:
> 
> > +static inline bool ieee80211_is_ps_disabled(struct ieee80211_conf *conf)
> 
> > +static inline bool ieee80211_is_ps_enabled(struct ieee80211_conf *conf)
> 
> Huh, is that worth the confusion? It seems !enabled should be the same
> as disabled, but it's not quite the same, which might be confusing.

In this patch there's no distinction, but after adding the off-channel
powersave state there is -- disabled == !enabled && !offchannel.
Actually one of the last bugs I fixed before sending these was a place
where I had used disabled instead of !enabled, and the frames ended up
with PM set when it shouldn't have been.

I agree though that the distinction is confusing. Maybe some better
state names are needed. Perhaps awake, offchannel, and doze?

> > +/**
> > + * ieee80211_set_ps_state - set device powersave state
> > + *
> > + * Sets the powersave state in the supplied device configuration to the
> > + * specified state.
> > + *
> > + * @conf: device configuration
> > + * @state: new powersave state. Must be one of the IEEE80211_CONF_PS_*
> > + *	flags from enum ieee80211_conf_flags.
> > + */
> > +static inline void ieee80211_set_ps_state(struct ieee80211_conf *conf,
> > +					  u32 state)
> > +{
> > +	conf->flags = (conf->flags & ~IEEE80211_CONF_PS_MASK) |
> > +		      (state & IEEE80211_CONF_PS_MASK);
> > +}
> 
> I don't think the driver should do this, so the inline shouldn't be
> here?

That's true. Would moving it to ieee80211_i.h be appropriate, or is
there somewhere better?

Seth