linux-kernel - Re: [PATCH v2] PM: sleep: wakeirq: fix wake irq warning in system suspend

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Date: Tue, 5 Mar 2024 12:41:16 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Johan Hovold <johan@...nel.org>, Qingliang Li <qingliang.li@...iatek.com>
Cc: Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Johan Hovold <johan+linaro@...nel.org>, Tony Lindgren <tony@...mide.com>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org, Dhruva Gole <d-gole@...com>
Subject: Re: [PATCH v2] PM: sleep: wakeirq: fix wake irq warning in system suspend

On Mon, Mar 4, 2024 at 4:19 PM Johan Hovold <johan@...nel.org> wrote:
>
> On Fri, Mar 01, 2024 at 05:26:57PM +0800, Qingliang Li wrote:
> > When driver uses pm_runtime_force_suspend() as the system suspend callback
> > function and registers the wake irq with reverse enable ordering, the wake
> > irq will be re-enabled when entering system suspend, triggering an
> > 'Unbalanced enable for IRQ xxx' warning. In this scenario, the call
> > sequence during system suspend is as follows:
> >   suspend_devices_and_enter()
> >     -> dpm_suspend_start()
> >       -> dpm_run_callback()
> >         -> pm_runtime_force_suspend()
> >           -> dev_pm_enable_wake_irq_check()
> >           -> dev_pm_enable_wake_irq_complete()
> >
> >     -> suspend_enter()
> >       -> dpm_suspend_noirq()
> >         -> device_wakeup_arm_wake_irqs()
> >           -> dev_pm_arm_wake_irq()
> >
> > To fix this issue, complete the setting of WAKE_IRQ_DEDICATED_ENABLED flag
> > in dev_pm_enable_wake_irq_complete() to avoid redundant irq enablement.
> >
> > Reviewed-by: Dhruva Gole <d-gole@...com>
> > Signed-off-by: Qingliang Li <qingliang.li@...iatek.com>
>
> Thanks for the fix. Looks correct to me:
>
> Reviewed-by: Johan Hovold <johan+linaro@...nel.org>
>
> I think you should add back the Fixes tag from v1 and CC stable as well:
>
> Fixes: 8527beb12087 ("PM: sleep: wakeirq: fix wake irq arming")
> Cc: stable@...r.kernel.org      # 5.16
>
> Note that WAKE_IRQ_DEDICATED_REVERSE was added in 5.16 by commit
> 259714100d98 ("PM / wakeirq: support enabling wake-up irq after
> runtime_suspend called") so no need to try to backport any further than
> that.

Applied as 6.9 material, tags added as suggested above.

Thanks!