linux-kernel - Re: [PATCH v2 2/6] clocksource: exynos_mct: Fix error path in timer resources initialization

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Message-ID: <CAJKOXPfUHOmMmwty0v-vSvr_110tGU5roo2DduJWPWu5q_to0A@mail.gmail.com>
Date:   Mon, 15 Oct 2018 17:26:18 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        will.deacon@....com, catalin.marinas@....com, marc.zyngier@....com,
        tglx@...utronix.de, daniel.lezcano@...aro.org,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Bartłomiej Żołnierkiewicz 
        <b.zolnierkie@...sung.com>, Inki Dae <inki.dae@...sung.com>
Subject: Re: [PATCH v2 2/6] clocksource: exynos_mct: Fix error path in timer
 resources initialization

On Mon, 15 Oct 2018 at 14:31, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
>
> While freeing interrupt handlers in error path, don't assume that all
> requested interrupts are per-processor interrupts and properly release
> standard interrupts too.

Thanks for fixing!

> Suggested-by: Krzysztof Kozlowski <krzk@...nel.org>

It is a bug so how about:
Reported-by: Krzysztof Kozlowski <krzk@...nel.org>
?

> Fixes: 56a94f13919c ("clocksource: exynos_mct: Avoid blocking calls in the cpu hotplug notifier")
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>

Anyway I am fine so:
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof

> ---
>  drivers/clocksource/exynos_mct.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
> index 43b335ff4a96..a379f11fad2d 100644
> --- a/drivers/clocksource/exynos_mct.c
> +++ b/drivers/clocksource/exynos_mct.c
> @@ -562,7 +562,19 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
>         return 0;
>
>  out_irq:
> -       free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
> +       if (mct_int_type == MCT_INT_PPI) {
> +               free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
> +       } else {
> +               for_each_possible_cpu(cpu) {
> +                       struct mct_clock_event_device *pcpu_mevt =
> +                               per_cpu_ptr(&percpu_mct_tick, cpu);
> +
> +                       if (pcpu_mevt->evt.irq != -1) {
> +                               free_irq(pcpu_mevt->evt.irq, pcpu_mevt);
> +                               pcpu_mevt->evt.irq = -1;
> +                       }
> +               }
> +       }
>         return err;
>  }
>
> --
> 2.17.1
>