wifi: iwlmei: send HOST_GOES_DOWN message even if wiamt is disabled

The HOST_GOES_DOWN message should be sent even if wiamt is disabled.
Otherwise wiamt may still use the shared memory (e.g. if enabled
later) while it's no longer valid.
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230822103048.2baad50eb1c3.If7b7c1dc2d6bfc6bacf7f6c72972f19714d9d973@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mei/main.c

@@ -2070,33 +2070,29 @@ static void iwl_mei_remove(struct mei_cl_device *cldev)
 
 	mutex_lock(&iwl_mei_mutex);
 
-	if (mei->amt_enabled) {
-		/*
-		 * Tell CSME that we are going down so that it won't access the
-		 * memory anymore, make sure this message goes through immediately.
-		 */
-		mei->csa_throttled = false;
-		iwl_mei_send_sap_msg(mei->cldev,
-				     SAP_MSG_NOTIF_HOST_GOES_DOWN);
-
-		for (i = 0; i < SEND_SAP_MAX_WAIT_ITERATION; i++) {
-			if (!iwl_mei_host_to_me_data_pending(mei))
-				break;
+	/* Tell CSME that we are going down so that it won't access the
+	 * memory anymore, make sure this message goes through immediately.
+	 */
+	mei->csa_throttled = false;
+	iwl_mei_send_sap_msg(mei->cldev,
+			     SAP_MSG_NOTIF_HOST_GOES_DOWN);
 
-			msleep(20);
-		}
+	for (i = 0; i < SEND_SAP_MAX_WAIT_ITERATION; i++) {
+		if (!iwl_mei_host_to_me_data_pending(mei))
+			break;
 
-		/*
-		 * If we couldn't make sure that CSME saw the HOST_GOES_DOWN
-		 * message, it means that it will probably keep reading memory
-		 * that we are going to unmap and free, expect IOMMU error
-		 * messages.
-		 */
-		if (i == SEND_SAP_MAX_WAIT_ITERATION)
-			dev_err(&mei->cldev->dev,
-				"Couldn't get ACK from CSME on HOST_GOES_DOWN message\n");
+		msleep(20);
 	}
 
+	/* If we couldn't make sure that CSME saw the HOST_GOES_DOWN
+	 * message, it means that it will probably keep reading memory
+	 * that we are going to unmap and free, expect IOMMU error
+	 * messages.
+	 */
+	if (i == SEND_SAP_MAX_WAIT_ITERATION)
+		dev_err(&mei->cldev->dev,
+			"Couldn't get ACK from CSME on HOST_GOES_DOWN message\n");
+
 	mutex_unlock(&iwl_mei_mutex);
 
 	/*