linux-kernel - Re: [PATCH] drm/omap: dsi: Add missing IRQF

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Message-ID: <CAJKOXPdPcQ1=UZiUumuLz8JSR2gTh=a-E01WE8ffdaa4+vsHUw@mail.gmail.com>
Date:   Fri, 16 Apr 2021 11:07:25 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Yang Li <yang.lee@...ux.alibaba.com>
Cc:     tomba@...nel.org, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/omap: dsi: Add missing IRQF_ONESHOT

On Mon, 22 Mar 2021 at 09:53, Yang Li <yang.lee@...ux.alibaba.com> wrote:
>
> fixed the following coccicheck:
> ./drivers/gpu/drm/omapdrm/dss/dsi.c:4329:7-27: ERROR: Threaded IRQ with
> no primary handler requested without IRQF_ONESHOT
>
> Make sure threaded IRQs without a primary handler are always request
> with IRQF_ONESHOT
>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> ---
>  drivers/gpu/drm/omapdrm/dss/dsi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index b31d750..844cb0b 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -4326,7 +4326,7 @@ static int omap_dsi_register_te_irq(struct dsi_data *dsi,
>
>         irq_set_status_flags(te_irq, IRQ_NOAUTOEN);
>
> -       err = request_threaded_irq(te_irq, NULL, omap_dsi_te_irq_handler,
> +       err = request_threaded_irq(te_irq | IRQF_ONESHOT, NULL, omap_dsi_te_irq_handler,
>                                    IRQF_TRIGGER_RISING, "TE", dsi);

Did you test it? There are several patches like this all over the tree
so it looks like "let's fix everything from Coccinelle". It's a trend
recently... multiple people send these patches. The point is that you
should not blindly follow coccinelle but adjust the change for real
case (e.g. is it a nested interrupt). Without this consideration and
testing - NACK.

Best regards,
Krzysztof