ath9k_htc: Do not support PowerSave by default

commit 6bca610d97b6139a1d7598b8009da9d339daa50f upstream.

It is a copy/paste of patch provided by Sujith for ath9k.

"Even though we make sure PowerSave is not enabled by default
by disabling the flag, WIPHY_FLAG_PS_ON_BY_DEFAULT on init,
PS could be enabled by userspace based on various factors
like battery usage etc. Since PS in ath9k is just broken
and has been untested for years, remove support for it, but
allow a user to explicitly enable it using a module parameter."

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_init.c b/drivers/net/wireless/ath/ath9k/htc_drv_init.c
index c3676bf1d6c45ab92d8a161d18ad5f3f0c586d18..50f991c89cfe32564df65a0e4b5d2d5bd143bcbe 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/htc_drv_init.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_init.c
@@ -34,6 +34,10 @@ static int ath9k_htc_btcoex_enable;
 module_param_named(btcoex_enable, ath9k_htc_btcoex_enable, int, 0444);
 MODULE_PARM_DESC(btcoex_enable, "Enable wifi-BT coexistence");
 
+static int ath9k_ps_enable;
+module_param_named(ps_enable, ath9k_ps_enable, int, 0444);
+MODULE_PARM_DESC(ps_enable, "Enable WLAN PowerSave");
+
 #define CHAN2G(_freq, _idx)  { \
        .center_freq = (_freq), \
        .hw_value = (_idx), \
@@ -725,12 +729,14 @@ static void ath9k_set_hw_capab(struct ath9k_htc_priv *priv,
                IEEE80211_HW_SPECTRUM_MGMT |
                IEEE80211_HW_HAS_RATE_CONTROL |
                IEEE80211_HW_RX_INCLUDES_FCS |
-               IEEE80211_HW_SUPPORTS_PS |
                IEEE80211_HW_PS_NULLFUNC_STACK |
                IEEE80211_HW_REPORTS_TX_ACK_STATUS |
                IEEE80211_HW_MFP_CAPABLE |
                IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
 
+       if (ath9k_ps_enable)
+               hw->flags |= IEEE80211_HW_SUPPORTS_PS;
+
        hw->wiphy->interface_modes =
                BIT(NL80211_IFTYPE_STATION) |
                BIT(NL80211_IFTYPE_ADHOC) |