mac80211: enable PS by default

Enable PS by default (depending on Kconfig) -- rely on drivers
to control the level using pm_qos. Due to the previous patch
we turn off PS when necessary due to latency requirements.

This has a Kconfig symbol so people can, if they really want,
configure the default in their kernels. We may want to keep it
at "default y" only in wireless-testing for a while.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/Kconfig

@@ -11,6 +11,22 @@ config MAC80211
 	  This option enables the hardware independent IEEE 802.11
 	  networking stack.
 
+config MAC80211_DEFAULT_PS
+	bool "enable powersave by default"
+	depends on MAC80211
+	default y
+	help
+	  This option enables powersave mode by default.
+
+	  If this causes your applications to misbehave you should fix your
+	  applications instead -- they need to register their network
+	  latency requirement, see Documentation/power/pm_qos_interface.txt.
+
+config MAC80211_DEFAULT_PS_VALUE
+	int
+	default 1 if MAC80211_DEFAULT_PS
+	default 0
+
 menu "Rate control algorithm selection"
 	depends on MAC80211 != n