serial: xilinx: Use platform_get_irq to get irq description structure

For systems with CONFIG_SERIAL_OF_PLATFORM=y and device_type =
"serial"; property in DT of_serial.c driver maps and unmaps IRQ (because
driver probe fails). Then a driver is called but irq mapping is not
created that's why driver is failing again in again on request_irq().
Based on this use platform_get_irq() instead of platform_get_resource()
which is doing irq_desc allocation and driver itself can request IRQ.

Fix both xilinx serial drivers in the tree.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index f218ec658f5d..3ddbac767db3 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1331,9 +1331,9 @@ static SIMPLE_DEV_PM_OPS(cdns_uart_dev_pm_ops, cdns_uart_suspend,
  */
 static int cdns_uart_probe(struct platform_device *pdev)
 {
-	int rc, id;
+	int rc, id, irq;
 	struct uart_port *port;
-	struct resource *res, *res2;
+	struct resource *res;
 	struct cdns_uart *cdns_uart_data;
 
 	cdns_uart_data = devm_kzalloc(&pdev->dev, sizeof(*cdns_uart_data),
@@ -1380,9 +1380,9 @@ static int cdns_uart_probe(struct platform_device *pdev)
 		goto err_out_clk_disable;
 	}
 
-	res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res2) {
-		rc = -ENODEV;
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		rc = -ENXIO;
 		goto err_out_clk_disable;
 	}
 
@@ -1411,7 +1411,7 @@ static int cdns_uart_probe(struct platform_device *pdev)
 		 * and triggers invocation of the config_port() entry point.
 		 */
 		port->mapbase = res->start;
-		port->irq = res2->start;
+		port->irq = irq;
 		port->dev = &pdev->dev;
 		port->uartclk = clk_get_rate(cdns_uart_data->uartclk);
 		port->private_data = cdns_uart_data;