wil6210: fix BACK status processing

When FW notifies about BACK status change, it provides ring ID.
Process BA status for requested connection only. As for now, FW
don't report Rx BACK status, it reports Tx one instead.
As per current algorithm used in the firmware, imply Rx BACK
state is in sync with Tx one
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/wil6210/wmi.c

@@ -563,17 +563,34 @@ static void wmi_evt_ba_status(struct wil6210_priv *wil, int id, void *d,
 			      int len)
 {
 	struct wmi_vring_ba_status_event *evt = d;
-	uint cid, i;
+	struct wil_sta_info *sta;
+	uint i, cid;
+
+	/* TODO: use Rx BA status, not Tx one */
 
 	wil_dbg_wmi(wil, "BACK[%d] %s {%d} timeout %d\n",
-		    evt->ringid, evt->status == WMI_BA_AGREED ? "OK" : "N/A",
+		    evt->ringid,
+		    evt->status == WMI_BA_AGREED ? "OK" : "N/A",
 		    evt->agg_wsize, __le16_to_cpu(evt->ba_timeout));
-	for (cid = 0; cid < WIL6210_MAX_CID; cid++) {
-		struct wil_sta_info *sta = &wil->sta[cid];
 
-		if (sta->status == wil_sta_unused)
-			continue;
-		wil_dbg_wmi(wil, "Init BACK for CID %d %pM\n", cid, sta->addr);
+	if (evt->ringid >= WIL6210_MAX_TX_RINGS) {
+		wil_err(wil, "invalid ring id %d\n", evt->ringid);
+		return;
+	}
+
+	cid = wil->vring2cid_tid[evt->ringid][0];
+	if (cid >= WIL6210_MAX_CID) {
+		wil_err(wil, "invalid CID %d for vring %d\n", cid, evt->ringid);
+		return;
+	}
+
+	sta = &wil->sta[cid];
+	if (sta->status == wil_sta_unused) {
+		wil_err(wil, "CID %d unused\n", cid);
+		return;
+	}
+
+	wil_dbg_wmi(wil, "BACK for CID %d %pM\n", cid, sta->addr);
 	for (i = 0; i < WIL_STA_TID_NUM; i++) {
 		struct wil_tid_ampdu_rx *r = sta->tid_rx[i];
 		sta->tid_rx[i] = NULL;
@@ -582,8 +599,6 @@ static void wmi_evt_ba_status(struct wil6210_priv *wil, int id, void *d,
 			sta->tid_rx[i] = wil_tid_ampdu_rx_alloc(wil,
 						evt->agg_wsize, 0);
 	}
-	}
-
 }
 
 static const struct {