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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/tty/serial/serial_core.c
.. .. @@ -2244,7 +2244,8 @@
2244 2244  
2245 2245  		spin_lock_irq(&uport->lock);
2246 2246  		ops->stop_tx(uport);
2247 -		ops->set_mctrl(uport, 0);
2247 +		if (!(uport->rs485.flags & SER_RS485_ENABLED))
2248 +			ops->set_mctrl(uport, 0);
2248 2249  		ops->stop_rx(uport);
2249 2250  		spin_unlock_irq(&uport->lock);
2250 2251

..	..	@@ -2244,7 +2244,8 @@
2244	2244
2245	2245	spin_lock_irq(&uport->lock);
2246	2246	ops->stop_tx(uport);
2247		- ops->set_mctrl(uport, 0);
	2247	+ if (!(uport->rs485.flags & SER_RS485_ENABLED))
	2248	+ ops->set_mctrl(uport, 0);
2248	2249	ops->stop_rx(uport);
2249	2250	spin_unlock_irq(&uport->lock);
2250	2251