提交 a19eda0f 编写于 作者: S Soren Brinkmann 提交者: Greg Kroah-Hartman

tty: xuartps: Acquire port lock for shutdown

Shutting down the UART port can happen while console operations are in
progress. Holding the port lock serializes these operations and avoids
the UART HW to be disabled in the middle of console prints.
Signed-off-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 4c0b92ed
......@@ -826,6 +826,9 @@ static int cdns_uart_startup(struct uart_port *port)
static void cdns_uart_shutdown(struct uart_port *port)
{
int status;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
/* Disable interrupts */
status = readl(port->membase + CDNS_UART_IMR_OFFSET);
......@@ -835,6 +838,9 @@ static void cdns_uart_shutdown(struct uart_port *port)
/* Disable the TX and RX */
writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS,
port->membase + CDNS_UART_CR_OFFSET);
spin_unlock_irqrestore(&port->lock, flags);
free_irq(port->irq, port);
}
......
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