Hi!
> From: Wang Kefeng <wangkefeng.wang@xxxxxxxxxx>
>
> commit eb4f756915875b0ea0757751cd29841f0504d547 upstream.
>
> After commit 77a7300abad7 ("of/irq: Get rid of NO_IRQ usage"),
> no irq case has been removed, irq_of_parse_and_map() will return
> 0 in all cases when get error from parse and map an interrupt into
> linux virq space.
>
> amba_device_register() is only used on no-DT initialization, see
> s3c64xx_pl080_init() arch/arm/mach-s3c/pl080.c
> ep93xx_init_devices() arch/arm/mach-ep93xx/core.c
>
> They won't set -1 to irq[0], so no need the warn.
AFAICT this does not fix any bug. It is simply a WARN that can not
trigger.
Best regards,
Pavel
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