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| author |   Jisheng Zhang <jszhang@kernel.org> | 2023-08-06 17:20:56 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-22 15:29:29 +0200 |
| commit | 22130dae0533c474e4e0db930a88caa9b397d083 (patch) | |
| tree | fa0cda6f33617266e24fa448369ee235ea5cd776 | |
| parent | dt-bindings: serial: snps-dw-apb-uart: make interrupt optional (diff) | |
| download | linux-rng-22130dae0533c474e4e0db930a88caa9b397d083.tar.xz linux-rng-22130dae0533c474e4e0db930a88caa9b397d083.zip | |
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: 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>
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 7db51781289e..f4cafca1a7da 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -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; |