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

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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: Jisheng Zhang <jszhang@kernel.org>
Link: https://lore.kernel.org/r/20230806092056.2467-3-jszhang@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jisheng Zhang 2023-08-06 17:20:56 +08:00 committed by Greg Kroah-Hartman
parent e9f0dff15a
commit 22130dae05
1 changed files with 4 additions and 1 deletions
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5
drivers/tty/serial/8250/8250_dw.c
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@ -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;