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Subject: Re: [PATCH v4 1/5] soc: qcom: rpmh-rsc: Corrently ignore
 CPU_CLUSTER_PM notifications
To:     Douglas Anderson <dianders@chromium.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        rafael.j.wysocki@intel.com, Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>
Cc:     mka@chromium.org, swboyd@chromium.org, evgreen@chromium.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20200422145408.v4.1.Ic7096b3b9b7828cdd41cd5469a6dee5eb6abf549@changeid>
From:   Maulik Shah <mkshah@codeaurora.org>
Message-ID: <7e060977-611e-abf5-af76-1cc91660a8ba@codeaurora.org>
Date:   Thu, 23 Apr 2020 10:15:04 +0530
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Hi,

there is a typo in subject, Corrently to correctly.
Other than this, fix seems good to me.

Reviewed-by: Maulik Shah <mkshah@codeaurora.org>

Thanks,
Maulik

On 4/23/2020 3:24 AM, Douglas Anderson wrote:
> Our switch statement doesn't have entries for CPU_CLUSTER_PM_ENTER,
> CPU_CLUSTER_PM_ENTER_FAILED, and CPU_CLUSTER_PM_EXIT and doesn't have
> a default.  This means that we'll try to do a flush in those cases but
> we won't necessarily be the last CPU down.  That's not so ideal since
> our (lack of) locking assumes we're on the last CPU.
>
> Luckily this isn't as big a problem as you'd think since (at least on
> the SoC I tested) we don't get these notifications except on full
> system suspend.  ...and on full system suspend we get them on the last
> CPU down.  That means that the worst problem we hit is flushing twice.
> Still, it's good to make it correct.
>
> Fixes: 985427f997b6 ("soc: qcom: rpmh: Invoke rpmh_flush() for dirty caches")
> Reported-by: Stephen Boyd <swboyd@chromium.org>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
>
> Changes in v4:
> - ("...Corrently ignore CPU_CLUSTER_PM notifications") split out for v4.
>
> Changes in v3: None
> Changes in v2: None
>
>   drivers/soc/qcom/rpmh-rsc.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
> index a9e15699f55f..3571a99fc839 100644
> --- a/drivers/soc/qcom/rpmh-rsc.c
> +++ b/drivers/soc/qcom/rpmh-rsc.c
> @@ -806,6 +806,8 @@ static int rpmh_rsc_cpu_pm_callback(struct notifier_block *nfb,
>   	case CPU_PM_EXIT:
>   		cpumask_clear_cpu(smp_processor_id(), &drv->cpus_entered_pm);
>   		goto exit;
> +	default:
> +		return NOTIFY_DONE;
>   	}
>   
>   	ret = rpmh_rsc_ctrlr_is_busy(drv);

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