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Subject: Re: [PATCH] drm/hisilicon: Remove redundant null check
To:     Tian Tao <tiantao6@hisilicon.com>, airlied@linux.ie,
        daniel@ffwll.ch, kraxel@redhat.com, alexander.deucher@amd.com,
        tglx@linutronix.de, dri-devel@lists.freedesktop.org,
        xinliang.liu@linaro.org, linux-kernel@vger.kernel.org
References: <1604050046-64539-1-git-send-email-tiantao6@hisilicon.com>
From:   Thomas Zimmermann <tzimmermann@suse.de>
Message-ID: <2dbbbad0-53cf-52cc-3b6b-0d1547f7e085@suse.de>
Date:   Mon, 2 Nov 2020 09:32:03 +0100
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In-Reply-To: <1604050046-64539-1-git-send-email-tiantao6@hisilicon.com>
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From: Thomas Zimmermann <tzimmermann@suse.de>
To: Tian Tao <tiantao6@hisilicon.com>, airlied@linux.ie, daniel@ffwll.ch,
 kraxel@redhat.com, alexander.deucher@amd.com, tglx@linutronix.de,
 dri-devel@lists.freedesktop.org, xinliang.liu@linaro.org,
 linux-kernel@vger.kernel.org
Message-ID: <2dbbbad0-53cf-52cc-3b6b-0d1547f7e085@suse.de>
Subject: Re: [PATCH] drm/hisilicon: Remove redundant null check
References: <1604050046-64539-1-git-send-email-tiantao6@hisilicon.com>
In-Reply-To: <1604050046-64539-1-git-send-email-tiantao6@hisilicon.com>

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Hi

Am 30.10.20 um 10:27 schrieb Tian Tao:
> drm_irq_uninstall can handle the case where dev->irq_enable is false,
> so Remove redundant null check.
>=20
> Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
> ---
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>=20
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/=
gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index 0c1b40d..b71589b1 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -246,13 +246,13 @@ static int hibmc_unload(struct drm_device *dev)
> =20
>  	drm_atomic_helper_shutdown(dev);
> =20
> -	if (dev->irq_enabled)
> -		drm_irq_uninstall(dev);
> -
> +	drm_irq_uninstall(dev);

Removing this check would at least result in an error, [1] so rather
leave it in for now.

Instead, we could discuss if drm_irq_install() should become a managed
interface.

Best regards
Thomas

[1]
https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/drm_irq.c#=
L201

>  	pci_disable_msi(dev->pdev);
> +
>  	hibmc_kms_fini(priv);
>  	hibmc_mm_fini(priv);
>  	dev->dev_private =3D NULL;
> +
>  	return 0;
>  }
> =20
>=20

--=20
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 N=C3=BCrnberg, Germany
(HRB 36809, AG N=C3=BCrnberg)
Gesch=C3=A4ftsf=C3=BChrer: Felix Imend=C3=B6rffer

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