wil6210: wait for disconnect completion

cfg80211_ops.disconnect() should wait for disconnect flow to
complete. If it does not, internal state becomes out of sync with
one in cfg80211. If one does stress test connect/disconnect
sequence, cfg80211 will issue next connect before disconnect
completed internally.

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/wil6210/cfg80211.c

@@ -535,7 +535,18 @@ static int wil_cfg80211_disconnect(struct wiphy *wiphy,
 
 	wil_dbg_misc(wil, "%s(reason=%d)\n", __func__, reason_code);
 
-	rc = wmi_send(wil, WMI_DISCONNECT_CMDID, NULL, 0);
+	if (!(test_bit(wil_status_fwconnecting, wil->status) ||
+	      test_bit(wil_status_fwconnected, wil->status))) {
+		wil_err(wil, "%s: Disconnect was called while disconnected\n",
+			__func__);
+		return 0;
+	}
+
+	rc = wmi_call(wil, WMI_DISCONNECT_CMDID, NULL, 0,
+		      WMI_DISCONNECT_EVENTID, NULL, 0,
+		      WIL6210_DISCONNECT_TO_MS);
+	if (rc)
+		wil_err(wil, "%s: disconnect error %d\n", __func__, rc);
 
 	return rc;
 }

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

@@ -23,9 +23,6 @@
 #include "wmi.h"
 #include "boot_loader.h"
 
-#define WAIT_FOR_DISCONNECT_TIMEOUT_MS 2000
-#define WAIT_FOR_DISCONNECT_INTERVAL_MS 10
-
 bool debug_fw; /* = false; */
 module_param(debug_fw, bool, S_IRUGO);
 MODULE_PARM_DESC(debug_fw, " do not perform card reset. For FW debug");
@@ -942,8 +939,7 @@ int wil_up(struct wil6210_priv *wil)
 
 int __wil_down(struct wil6210_priv *wil)
 {
-	int iter = WAIT_FOR_DISCONNECT_TIMEOUT_MS /
-			WAIT_FOR_DISCONNECT_INTERVAL_MS;
+	int rc;
 
 	WARN_ON(!mutex_is_locked(&wil->mutex));
 
@@ -967,22 +963,16 @@ int __wil_down(struct wil6210_priv *wil)
 	}
 
 	if (test_bit(wil_status_fwconnected, wil->status) ||
-	    test_bit(wil_status_fwconnecting, wil->status))
-		wmi_send(wil, WMI_DISCONNECT_CMDID, NULL, 0);
+	    test_bit(wil_status_fwconnecting, wil->status)) {
 
-	/* make sure wil is idle (not connected) */
-	mutex_unlock(&wil->mutex);
-	while (iter--) {
-		int idle = !test_bit(wil_status_fwconnected, wil->status) &&
-			   !test_bit(wil_status_fwconnecting, wil->status);
-		if (idle)
-			break;
-		msleep(WAIT_FOR_DISCONNECT_INTERVAL_MS);
+		mutex_unlock(&wil->mutex);
+		rc = wmi_call(wil, WMI_DISCONNECT_CMDID, NULL, 0,
+			      WMI_DISCONNECT_EVENTID, NULL, 0,
+			      WIL6210_DISCONNECT_TO_MS);
+		mutex_lock(&wil->mutex);
+		if (rc)
+			wil_err(wil, "timeout waiting for disconnect\n");
 	}
-	mutex_lock(&wil->mutex);
-
-	if (iter < 0)
-		wil_err(wil, "timeout waiting for idle FW/HW\n");
 
 	wil_reset(wil, false);
 

drivers/net/wireless/ath/wil6210/wil6210.h

@@ -92,6 +92,7 @@ static inline u32 wil_mtu2macbuf(u32 mtu)
 #define WIL6210_FW_RECOVERY_RETRIES	(5) /* try to recover this many times */
 #define WIL6210_FW_RECOVERY_TO	msecs_to_jiffies(5000)
 #define WIL6210_SCAN_TO		msecs_to_jiffies(10000)
+#define WIL6210_DISCONNECT_TO_MS (2000)
 #define WIL6210_RX_HIGH_TRSH_INIT		(0)
 #define WIL6210_RX_HIGH_TRSH_DEFAULT \
 				(1 << (WIL_RX_RING_SIZE_ORDER_DEFAULT - 3))