Commit 22130dae authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Greg Kroah-Hartman
Browse files

serial: 8250_dw: fall back to poll if there's no interrupt 



When there's no irq(this can be due to various reasons, for example,
no irq from HW support, or we just want to use poll solution, and so
on), falling back to poll is still better than no support at all.

Signed-off-by: default avatarJisheng Zhang <jszhang@kernel.org>
Link: https://lore.kernel.org/r/20230806092056.2467-3-jszhang@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e9f0dff1

drivers/tty/serial/8250/8250_dw.c

+4 −1
Original line number Diff line number Diff line
@@ -523,7 +523,10 @@ static int dw8250_probe(struct platform_device *pdev) 
	if (!regs)

		return dev_err_probe(dev, -EINVAL, "no registers defined\n");



	irq = platform_get_irq(pdev, 0);

	irq = platform_get_irq_optional(pdev, 0);

	/* no interrupt -> fall back to polling */

	if (irq == -ENXIO)

		irq = 0;

	if (irq < 0)

		return irq;