[PATCH net-next 1/4] can: sun4i_can: don't discard the IRQ lookup error in probe

[Chaosheng Qu]

sun4ican_probe() collapses every failure of platform_get_irq() into
-ENODEV:

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		err = -ENODEV;
		goto exit_put_clk;
	}

The driver matches through an of_match_table, so of_irq_get() returns
-EPROBE_DEFER while the interrupt controller has not been probed. The
probe overwrites it and the driver core stops retrying, leaving the
device unbound even though the interrupt controller appears later.

Return the lookup error unchanged, which is what the neighbouring CAN
platform drivers do, e.g. commit 057bd6168d98 ("can: cc770: don't
discard the IRQ lookup error in probe").

A device tree without an interrupt now reports -ENXIO rather than
-ENODEV; the driver core treats both as a failed probe.

Build tested on x86_64.

Assisted-by: LLM
Signed-off-by: Chaosheng Qu <chaosheng.qu.linux@xxxxxxxxx>
---
 drivers/net/can/sun4i_can.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index 76db6d09d1e6..a6c761506244 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -856,7 +856,7 @@ static int sun4ican_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		err = -ENODEV;
+		err = irq;
 		goto exit_put_clk;
 	}
 
-- 
2.43.0