linux-kernel - Re: [PATCH v2] drm/v3d: Fix PM disable depth imbalance in v3d_platform_drm

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Message-ID: <CAPY8ntAz2V81gwO6O+KxLev38Dy8wKGKW_SWDnEo8CU66qpe0w@mail.gmail.com>
Date:   Fri, 7 Jan 2022 11:03:57 +0000
From:   Dave Stevenson <dave.stevenson@...pberrypi.com>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     David Airlie <airlied@...ux.ie>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Eric Anholt <emma@...olt.net>, Eric Anholt <eric@...olt.net>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/v3d: Fix PM disable depth imbalance in v3d_platform_drm_probe

On Thu, 6 Jan 2022 at 12:47, Miaoqian Lin <linmq006@...il.com> wrote:
>
> The pm_runtime_enable will increase power disable depth.
> If the probe fails, we should use pm_runtime_disable() to balance
> pm_runtime_enable().
>
> Fixes: 57692c9 ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Thanks for the update - that looks good to me.

Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>

> ---
> Changes in v2
> - put pm_runtime_disable before dma_free_wc
> - rename dma_free to pm_disable
> ---
>  drivers/gpu/drm/v3d/v3d_drv.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
> index bd46396a1ae0..7d500dd5314e 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.c
> +++ b/drivers/gpu/drm/v3d/v3d_drv.c
> @@ -282,7 +282,7 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
>
>         ret = v3d_gem_init(drm);
>         if (ret)
> -               goto dma_free;
> +               goto pm_disable;
>
>         ret = v3d_irq_init(v3d);
>         if (ret)
> @@ -298,7 +298,8 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
>         v3d_irq_disable(v3d);
>  gem_destroy:
>         v3d_gem_destroy(drm);
> -dma_free:
> +pm_disable:
> +       pm_runtime_disable(dev);
>         dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
>         return ret;
>  }
> --
> 2.17.1
>