add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/media/dvb-core/dvb_frontend.c
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@@ -135,7 +135,7 @@
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 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
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 	if (fepriv)
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-		dvb_free_device(fepriv->dvbdev);
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+		dvb_device_put(fepriv->dvbdev);
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 	dvb_frontend_invoke_release(fe, fe->ops.release);
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@@ -292,14 +292,22 @@
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 	}
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 	if (events->eventw == events->eventr) {
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-		int ret;
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+		struct wait_queue_entry wait;
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+		int ret = 0;
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 		if (flags & O_NONBLOCK)
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 			return -EWOULDBLOCK;
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-		ret = wait_event_interruptible(events->wait_queue,
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-					       dvb_frontend_test_event(fepriv, events));
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-
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+		init_waitqueue_entry(&wait, current);
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+		add_wait_queue(&events->wait_queue, &wait);
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+		while (!dvb_frontend_test_event(fepriv, events)) {
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+			wait_woken(&wait, TASK_INTERRUPTIBLE, 0);
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+			if (signal_pending(current)) {
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+				ret = -ERESTARTSYS;
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+				break;
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+			}
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+		}
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+		remove_wait_queue(&events->wait_queue, &wait);
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 		if (ret < 0)
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 			return ret;
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 	}
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@@ -2961,6 +2969,7 @@
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 		.name = fe->ops.info.name,
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 #endif
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 	};
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+	int ret;
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 	dev_dbg(dvb->device, "%s:\n", __func__);
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@@ -2994,8 +3003,13 @@
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 		 "DVB: registering adapter %i frontend %i (%s)...\n",
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 		 fe->dvb->num, fe->id, fe->ops.info.name);
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-	dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
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+	ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
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 			    fe, DVB_DEVICE_FRONTEND, 0);
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+	if (ret) {
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+		dvb_frontend_put(fe);
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+		mutex_unlock(&frontend_mutex);
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+		return ret;
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+	}
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 	/*
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 	 * Initialize the cache to the proper values according with the