[PATCH] serial: cpm_uart: use irq variable for platform_get_irq()

[Rosen Penev]

struct uart_port has its irq member as an unsigned int, which does not
work when platform_get_irq() returns an error.

Use a local irq variable to handle this and write to struct uart_port's
irq member when platform_get_irq() succeeds. On success, it returns an
IRQ >= 0, which is representable by unsigned int.

Fixes: 831603b3e8aa ("serial: cpm_uart: replace irq_of_parse_and_map with platform_get_irq")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202609251916.1XlVHLwd-lkp@xxxxxxxxx/
Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
---
 drivers/tty/serial/cpm_uart.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/cpm_uart.c b/drivers/tty/serial/cpm_uart.c
index 39f54bb7b485..ca0acccd3dd8 100644
--- a/drivers/tty/serial/cpm_uart.c
+++ b/drivers/tty/serial/cpm_uart.c
@@ -1517,6 +1517,7 @@ static int cpm_uart_probe(struct platform_device *ofdev)
 {
 	int index = probe_index++;
 	struct uart_cpm_port *pinfo = &cpm_uart_ports[index];
+	int irq;
 	int ret;
 
 	pinfo->port.line = index;
@@ -1524,14 +1525,15 @@ static int cpm_uart_probe(struct platform_device *ofdev)
 	if (index >= UART_NR)
 		return -ENODEV;
 
+	irq = platform_get_irq(ofdev, 0);
+	if (irq < 0)
+		return irq;
+
 	platform_set_drvdata(ofdev, pinfo);
 
 	/* initialize the device pointer for the port */
 	pinfo->port.dev = &ofdev->dev;
-
-	pinfo->port.irq = platform_get_irq(ofdev, 0);
-	if (pinfo->port.irq < 0)
-		return pinfo->port.irq;
+	pinfo->port.irq = irq;
 
 	ret = cpm_uart_init_port(ofdev->dev.of_node, pinfo);
 	if (!ret)
-- 
2.55.0