mac80211: remove short slot/short preamble incapable flags

There are no drivers setting IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE
or IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE, so any code using the
two flags is dead; it's also exceedingly unlikely that any new driver
could ever need to set these flags.

The wcn36xx code is almost certainly broken, but this preserves the
previous behaviour.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/ath/wcn36xx/smd.c

@@ -216,9 +216,7 @@ static void wcn36xx_smd_set_sta_params(struct wcn36xx *wcn,
 		memcpy(&sta_params->bssid, vif->addr, ETH_ALEN);
 
 	sta_params->encrypt_type = priv_vif->encrypt_type;
-	sta_params->short_preamble_supported =
-		!(WCN36XX_FLAGS(wcn) &
-		  IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE);
+	sta_params->short_preamble_supported = true;
 
 	sta_params->rifs_mode = 0;
 	sta_params->rmf = 0;

include/net/mac80211.h

@@ -446,12 +446,8 @@ struct ieee80211_event {
  * @ibss_creator: indicates if a new IBSS network is being created
  * @aid: association ID number, valid only when @assoc is true
  * @use_cts_prot: use CTS protection
- * @use_short_preamble: use 802.11b short preamble;
- *	if the hardware cannot handle this it must set the
- *	IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE hardware flag
- * @use_short_slot: use short slot time (only relevant for ERP);
- *	if the hardware cannot handle this it must set the
- *	IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag
+ * @use_short_preamble: use 802.11b short preamble
+ * @use_short_slot: use short slot time (only relevant for ERP)
  * @dtim_period: num of beacons before the next DTIM, for beaconing,
  *	valid in station mode only if after the driver was notified
  *	with the %BSS_CHANGED_BEACON_INFO flag, will be non-zero then.
@@ -1784,13 +1780,6 @@ struct ieee80211_txq {
  *	multicast frames when there are power saving stations so that
  *	the driver can fetch them with ieee80211_get_buffered_bc().
  *
- * @IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE:
- *	Hardware is not capable of short slot operation on the 2.4 GHz band.
- *
- * @IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE:
- *	Hardware is not capable of receiving frames with short preamble on
- *	the 2.4 GHz band.
- *
  * @IEEE80211_HW_SIGNAL_UNSPEC:
  *	Hardware can provide signal values but we don't know its units. We
  *	expect values between 0 and @max_signal.
@@ -1903,8 +1892,6 @@ enum ieee80211_hw_flags {
 	IEEE80211_HW_HAS_RATE_CONTROL			= 1<<0,
 	IEEE80211_HW_RX_INCLUDES_FCS			= 1<<1,
 	IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING	= 1<<2,
-	IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE		= 1<<3,
-	IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE	= 1<<4,
 	IEEE80211_HW_SIGNAL_UNSPEC			= 1<<5,
 	IEEE80211_HW_SIGNAL_DBM				= 1<<6,
 	IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC		= 1<<7,

net/mac80211/debugfs.c

-
 /*
  * mac80211 debugfs for wireless PHYs
  *
@@ -112,12 +111,6 @@ static ssize_t hwflags_read(struct file *file, char __user *user_buf,
 	if (local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)
 		sf += scnprintf(buf + sf, mxln - sf,
 				"HOST_BCAST_PS_BUFFERING\n");
-	if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)
-		sf += scnprintf(buf + sf, mxln - sf,
-				"2GHZ_SHORT_SLOT_INCAPABLE\n");
-	if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)
-		sf += scnprintf(buf + sf, mxln - sf,
-				"2GHZ_SHORT_PREAMBLE_INCAPABLE\n");
 	if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 		sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_UNSPEC\n");
 	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)

net/mac80211/mesh_plink.c

@@ -106,9 +106,7 @@ static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
 		/* (IEEE 802.11-2012 19.4.5) */
 		short_slot = true;
 		goto out;
-	} else if (band != IEEE80211_BAND_2GHZ ||
-		   (band == IEEE80211_BAND_2GHZ &&
-		    local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
+	} else if (band != IEEE80211_BAND_2GHZ)
 		goto out;
 
 	for (i = 0; i < sband->n_bitrates; i++)

net/mac80211/mlme.c

@@ -669,9 +669,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 	capab = WLAN_CAPABILITY_ESS;
 
 	if (sband->band == IEEE80211_BAND_2GHZ) {
-		if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 		capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
-		if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 		capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 	}
 

net/mac80211/tdls.c

@@ -167,23 +167,16 @@ static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
 					u16 status_code)
 {
-	struct ieee80211_local *local = sdata->local;
-	u16 capab;
-
 	/* The capability will be 0 when sending a failure code */
 	if (status_code != 0)
 		return 0;
 
-	capab = 0;
-	if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
-		return capab;
-
-	if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
-		capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
-	if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
-		capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
+	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_2GHZ) {
+		return WLAN_CAPABILITY_SHORT_SLOT_TIME |
+		       WLAN_CAPABILITY_SHORT_PREAMBLE;
+	}
 
-	return capab;
+	return 0;
 }
 
 static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,