nl80211: simplify peer specific TID configuration

Current rule for applying TID configuration for specific peer looks overly
complicated. No need to reject new TID configuration when override flag is
specified. Another call with the same TID configuration, but without
override flag, allows to apply new configuration anyway.

Use the same approach as for the 'all peers' case: if override flag is
specified, then reset existing TID configuration and immediately
apply a new one.
Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Link: https://lore.kernel.org/r/20200424112905.26770-5-sergey.matyukevich.os@quantenna.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/uapi/linux/nl80211.h

@@ -4823,12 +4823,10 @@ enum nl80211_tid_config {
  *	(%NL80211_TID_CONFIG_ATTR_TIDS, %NL80211_TID_CONFIG_ATTR_OVERRIDE).
  * @NL80211_TID_CONFIG_ATTR_PEER_SUPP: same as the previous per-vif one, but
  *	per peer instead.
- * @NL80211_TID_CONFIG_ATTR_OVERRIDE: flag attribue, if no peer
- *	is selected, if set indicates that the new configuration overrides
- *	all previous peer configurations, otherwise previous peer specific
- *	configurations should be left untouched. If peer is selected then
- *	it will reset particular TID configuration of that peer and it will
- *	not accept other TID config attributes along with peer.
+ * @NL80211_TID_CONFIG_ATTR_OVERRIDE: flag attribue, if set indicates
+ *	that the new configuration overrides all previous peer
+ *	configurations, otherwise previous peer specific configurations
+ *	should be left untouched.
  * @NL80211_TID_CONFIG_ATTR_TIDS: a bitmask value of TIDs (bit 0 to 7)
  *	Its type is u16.
  * @NL80211_TID_CONFIG_ATTR_NOACK: Configure ack policy for the TID.

net/wireless/nl80211.c

@@ -14036,10 +14036,7 @@ static int parse_tid_conf(struct cfg80211_registered_device *rdev,
 		if (rdev->ops->reset_tid_config) {
 			err = rdev_reset_tid_config(rdev, dev, peer,
 						    tid_conf->tids);
-			/* If peer is there no other configuration will be
-			 * allowed
-			 */
-			if (err || peer)
+			if (err)
 				return err;
 		} else {
 			return -EINVAL;