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UPSTREAM: 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>

Bug: 305779335
Change-Id: I1c9f007883e1c203c1ca63dfe0b4f923c5c56f15
(cherry picked from commit 22130dae0533c474e4e0db930a88caa9b397d083)
Signed-off-by: Jacky Liu <qsliu@google.com>
This commit is contained in:
Jisheng Zhang 2023-08-06 17:20:56 +08:00 committed by Jacky Liu
parent 35361bdac2
commit 37c1a91404
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;