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>

2 files changed, 12 insertions, 11 deletions

diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 708eead850b0..b1c6bd3d483f 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -632,7 +632,8 @@ MODULE_DEVICE_TABLE(of, ulite_of_match);
 
 static int ulite_probe(struct platform_device *pdev)
 {
-        struct resource *res, *res2;
+        struct resource *res;
+        int irq;
         int id = pdev->id;
 #ifdef CONFIG_OF
         const __be32 *prop;
@@ -646,11 +647,11 @@ static int ulite_probe(struct platform_device *pdev)
         if (!res)
                 return -ENODEV;
 
-        res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-        if (!res2)
-                return -ENODEV;
+        irq = platform_get_irq(pdev, 0);
+        if (irq <= 0)
+                return -ENXIO;
 
-        return ulite_assign(&pdev->dev, id, res->start, res2->start);
+        return ulite_assign(&pdev->dev, id, res->start, irq);
 }
 
 static int ulite_remove(struct platform_device *pdev)
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;