Re: [PATCH net-next v2] net: phy: broadcom: Register dummy IRQ handler

[Simon Horman]

On Thu, May 25, 2023 at 10:59:15AM -0700, Florian Fainelli wrote:
> In order to have our interrupt descriptor fully setup and in particular
> the action, ensure that we register a full fledged interrupt handler.
> This also allow us to set the interrupt polarity and flow through the
> same call.
> 
> This is specifically necessary for kernel/irq/pm.c::suspend_device_irq
> to set the interrupt descriptor to the IRQD_WAKEUP_ARMED state and
> enable the interrupt for wake-up since it was still in a disabled state.
> 
> Without an interrupt descriptor we would have ran into cases where the
> wake-up interrupt is not capable of waking up the system, specifically
> if we resumed the system ACPI S5 using the Ethernet PHY. In that case
> the Ethernet PHY interrupt would be pending by the time the kernel
> booted, which it would acknowledge but then we could never use it as
> a wake-up source again.
> 
> Fixes: 8baddaa9d4ba ("net: phy: broadcom: Add support for Wake-on-LAN")
> Suggested-by: Doug Berger <doug.berger@xxxxxxxxxxxx>
> Debugged-by: Doug Berger <doug.berger@xxxxxxxxxxxx>
> Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>

Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>