linux-kernel - Re: [PATCH] drm/etnaviv: Fix missing mutex

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Message-ID: <CAH9NwWf-BODALL3dPgERY6i-KzeghbsWR_zHFv_BPjkiLQbQhw@mail.gmail.com>
Date: Mon, 26 Aug 2024 16:33:52 +0200
From: Christian Gmeiner <christian.gmeiner@...il.com>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>
Cc: Lucas Stach <l.stach@...gutronix.de>, Russell King <linux+etnaviv@...linux.org.uk>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, etnaviv@...ts.freedesktop.org, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/etnaviv: Fix missing mutex_destroy()

Am So., 25. Aug. 2024 um 14:15 Uhr schrieb Sui Jingfeng
<sui.jingfeng@...ux.dev>:
>
> Currently, the calling of mutex_destroy() is ignored on error handling
> code path. It is safe for now, since mutex_destroy() actually does
> nothing in non-debug builds. But the mutex_destroy() is used to mark
> the mutex uninitialized on debug builds, and any subsequent use of the
> mutex is forbidden.
>
> It also could lead to problems if mutex_destroy() gets extended, add
> missing mutex_destroy() to eliminate potential concerns.
>
> Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>

Reviewed-by: Christian Gmeiner <cgmeiner@...lia.com>

> ---
>  drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c | 3 +++
>  drivers/gpu/drm/etnaviv/etnaviv_drv.c    | 1 +
>  drivers/gpu/drm/etnaviv/etnaviv_gem.c    | 1 +
>  drivers/gpu/drm/etnaviv/etnaviv_gpu.c    | 5 +++++
>  drivers/gpu/drm/etnaviv/etnaviv_mmu.c    | 2 +-
>  5 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c b/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c
> index 721d633aece9..1edc02022be4 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c
> @@ -79,6 +79,9 @@ void etnaviv_cmdbuf_suballoc_destroy(struct etnaviv_cmdbuf_suballoc *suballoc)
>  {
>         dma_free_wc(suballoc->dev, SUBALLOC_SIZE, suballoc->vaddr,
>                     suballoc->paddr);
> +
> +       mutex_destroy(&suballoc->lock);
> +
>         kfree(suballoc);
>  }
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> index 6500f3999c5f..7844cd961a29 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> @@ -564,6 +564,7 @@ static int etnaviv_bind(struct device *dev)
>  out_destroy_suballoc:
>         etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
>  out_free_priv:
> +       mutex_destroy(&priv->gem_lock);
>         kfree(priv);
>  out_put:
>         drm_dev_put(drm);
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> index fe665ca20c02..b68e3b235a7d 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> @@ -515,6 +515,7 @@ void etnaviv_gem_free_object(struct drm_gem_object *obj)
>         etnaviv_obj->ops->release(etnaviv_obj);
>         drm_gem_object_release(obj);
>
> +       mutex_destroy(&etnaviv_obj->lock);
>         kfree(etnaviv_obj);
>  }
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> index af52922ff494..d6acc4c68102 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> @@ -1929,8 +1929,13 @@ static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
>
>  static void etnaviv_gpu_platform_remove(struct platform_device *pdev)
>  {
> +       struct etnaviv_gpu *gpu = dev_get_drvdata(&pdev->dev);
> +
>         component_del(&pdev->dev, &gpu_ops);
>         pm_runtime_disable(&pdev->dev);
> +
> +       mutex_destroy(&gpu->lock);
> +       mutex_destroy(&gpu->sched_lock);
>  }
>
>  static int etnaviv_gpu_rpm_suspend(struct device *dev)
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> index e3be16165c86..ed6c42384856 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> @@ -361,7 +361,7 @@ static void etnaviv_iommu_context_free(struct kref *kref)
>                 container_of(kref, struct etnaviv_iommu_context, refcount);
>
>         etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping);
> -
> +       mutex_destroy(&context->lock);
>         context->global->ops->free(context);
>  }
>  void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context)
> --
> 2.34.1
>


-- 
greets
--
Christian Gmeiner, MSc

https://christian-gmeiner.info/privacypolicy