ath6kl: Report unique remain-on-channel cookie values

Even though only a single concurrent remain-on-channel operation is
supported, there may be two pending remain-on-channel events (one to
indicate end of a canceled operation and another to indicate start of a
new operation). User space won't be able to distinguish these events
unless unique cookies are used.

The previous behavior resulted in wpa_supplicant getting quite
confused about the driver's offchannel state in various sequences
and this made the P2P state machine behave incorrectly. Use of
more than a single remain-on-channel cookie value fixes this.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath6kl/cfg80211.c

@@ -1932,10 +1932,16 @@ static int ath6kl_remain_on_channel(struct wiphy *wiphy,
 {
 	struct ath6kl *ar = ath6kl_priv(dev);
 	struct ath6kl_vif *vif = netdev_priv(dev);
+	u32 id;
 
 	/* TODO: if already pending or ongoing remain-on-channel,
 	 * return -EBUSY */
-	*cookie = 1; /* only a single pending request is supported */
+	id = ++vif->last_roc_id;
+	if (id == 0) {
+		/* Do not use 0 as the cookie value */
+		id = ++vif->last_roc_id;
+	}
+	*cookie = id;
 
 	return ath6kl_wmi_remain_on_chnl_cmd(ar->wmi, vif->fw_vif_idx,
 					     chan->center_freq, duration);
@@ -1948,8 +1954,9 @@ static int ath6kl_cancel_remain_on_channel(struct wiphy *wiphy,
 	struct ath6kl *ar = ath6kl_priv(dev);
 	struct ath6kl_vif *vif = netdev_priv(dev);
 
-	if (cookie != 1)
+	if (cookie != vif->last_roc_id)
 		return -ENOENT;
+	vif->last_cancel_roc_id = cookie;
 
 	return ath6kl_wmi_cancel_remain_on_chnl_cmd(ar->wmi, vif->fw_vif_idx);
 }

drivers/net/wireless/ath/ath6kl/core.h

@@ -427,6 +427,8 @@ struct ath6kl_vif {
 	struct cfg80211_scan_request *scan_req;
 	enum sme_state sme_state;
 	int reconnect_flag;
+	u32 last_roc_id;
+	u32 last_cancel_roc_id;
 	u32 send_action_id;
 	bool probe_req_report;
 	u16 next_chan;

drivers/net/wireless/ath/ath6kl/wmi.c

@@ -443,6 +443,7 @@ static int ath6kl_wmi_remain_on_chnl_event_rx(struct wmi *wmi, u8 *datap,
 	u32 dur;
 	struct ieee80211_channel *chan;
 	struct ath6kl *ar = wmi->parent_dev;
+	u32 id;
 
 	if (len < sizeof(*ev))
 		return -EINVAL;
@@ -458,7 +459,8 @@ static int ath6kl_wmi_remain_on_chnl_event_rx(struct wmi *wmi, u8 *datap,
 			   "(freq=%u)\n", freq);
 		return -EINVAL;
 	}
-	cfg80211_ready_on_channel(vif->ndev, 1, chan, NL80211_CHAN_NO_HT,
+	id = vif->last_roc_id;
+	cfg80211_ready_on_channel(vif->ndev, id, chan, NL80211_CHAN_NO_HT,
 				  dur, GFP_ATOMIC);
 
 	return 0;
@@ -473,6 +475,7 @@ static int ath6kl_wmi_cancel_remain_on_chnl_event_rx(struct wmi *wmi,
 	u32 dur;
 	struct ieee80211_channel *chan;
 	struct ath6kl *ar = wmi->parent_dev;
+	u32 id;
 
 	if (len < sizeof(*ev))
 		return -EINVAL;
@@ -488,7 +491,13 @@ static int ath6kl_wmi_cancel_remain_on_chnl_event_rx(struct wmi *wmi,
 			   "channel (freq=%u)\n", freq);
 		return -EINVAL;
 	}
-	cfg80211_remain_on_channel_expired(vif->ndev, 1, chan,
+	if (vif->last_cancel_roc_id &&
+	    vif->last_cancel_roc_id + 1 == vif->last_roc_id)
+		id = vif->last_cancel_roc_id; /* event for cancel command */
+	else
+		id = vif->last_roc_id; /* timeout on uncanceled r-o-c */
+	vif->last_cancel_roc_id = 0;
+	cfg80211_remain_on_channel_expired(vif->ndev, id, chan,
 					   NL80211_CHAN_NO_HT, GFP_ATOMIC);
 
 	return 0;