rtl8187: make CTS-to-self protection work

CTS protection was not working properly because the HW needs
RTS flag to be asserted, and it need also RTS duration field to be
filled with CTS-to-self duration.

This patch makes the driver to do this.

Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rtl818x/rtl8187/dev.c b/drivers/net/wireless/rtl818x/rtl8187/dev.c
index 6e4b177..629ad8c 100644 (file)
--- a/drivers/net/wireless/rtl818x/rtl8187/dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8187/dev.c
@@ -253,14 +253,21 @@ static void rtl8187_tx(struct ieee80211_hw *dev,
        flags |= ieee80211_get_tx_rate(dev, info)->hw_value << 24;
        if (ieee80211_has_morefrags(tx_hdr->frame_control))
                flags |= RTL818X_TX_DESC_FLAG_MOREFRAG;
+
+       /* HW will perform RTS-CTS when only RTS flags is set.
+        * HW will perform CTS-to-self when both RTS and CTS flags are set.
+        * RTS rate and RTS duration will be used also for CTS-to-self.
+        */
        if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
                flags |= RTL818X_TX_DESC_FLAG_RTS;
                flags |= ieee80211_get_rts_cts_rate(dev, info)->hw_value << 19;
                rts_dur = ieee80211_rts_duration(dev, priv->vif,
                                                 skb->len, info);
        } else if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
-               flags |= RTL818X_TX_DESC_FLAG_CTS;
+               flags |= RTL818X_TX_DESC_FLAG_RTS | RTL818X_TX_DESC_FLAG_CTS;
                flags |= ieee80211_get_rts_cts_rate(dev, info)->hw_value << 19;
+               rts_dur = ieee80211_ctstoself_duration(dev, priv->vif,
+                                                skb->len, info);
        }
 
        if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {