[PATCH 2/3] tty: serial: imx: Propagate errors from optional IRQ lookup

[phucduc.bui at gmail.com]

From: bui duc phuc <phucduc.bui at gmail.com>

platform_get_irq_optional() returns a positive IRQ number on success or
a negative error code on failure. For an optional IRQ, -ENXIO indicates
that no IRQ is available, while other errors should be propagated.

Propagate errors such as -EPROBE_DEFER and -EINVAL instead of continuing
probe without the IRQ.

Signed-off-by: bui duc phuc <phucduc.bui at gmail.com>
---
 drivers/tty/serial/imx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 251a50c8aa38..4224454d360e 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2463,7 +2463,11 @@ static int imx_uart_probe(struct platform_device *pdev)
 	if (rxirq < 0)
 		return rxirq;
 	txirq = platform_get_irq_optional(pdev, 1);
+	if (txirq < 0 && txirq != -ENXIO)
+		return txirq;
 	rtsirq = platform_get_irq_optional(pdev, 2);
+	if (rtsirq < 0 && rtsirq != -ENXIO)
+		return rtsirq;
 
 	sport->port.dev = &pdev->dev;
 	sport->port.mapbase = res->start;
-- 
2.43.0