Hi,

On 07. 02. 22, 6:58, Hammer Hsieh wrote:

+static void sunplus_shutdown(struct uart_port *port)
+{
+	unsigned long flags;
+	unsigned int isc;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	isc = readl(port->membase + SUP_UART_ISC);
+	isc &= ~(SUP_UART_ISC_RXM | SUP_UART_ISC_TXM);

Is this correct? I mean: will the SUP_UART_ISC read contain the control 
bits, not only status bits?

+	writel(isc, port->membase + SUP_UART_ISC);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	free_irq(port->irq, port);

I am still waiting for explanation why this is safe with respect to 
posted writes.

regards,
-- 
js
suse labs