linux-kernel - Re: [PATCH] drm/i915/gvt: more locking for ppgtt mm LRU list

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Message-ID: <20200210014314.GA28133@zhen-hp.sh.intel.com>
Date:   Mon, 10 Feb 2020 09:43:14 +0800
From:   Zhenyu Wang <zhenyuw@...ux.intel.com>
To:     Igor Druzhinin <igor.druzhinin@...rix.com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org, airlied@...ux.ie,
        joonas.lahtinen@...ux.intel.com, jani.nikula@...ux.intel.com,
        zhenyuw@...ux.intel.com, daniel@...ll.ch, rodrigo.vivi@...el.com,
        zhi.a.wang@...el.com
Subject: Re: [PATCH] drm/i915/gvt: more locking for ppgtt mm LRU list

On 2020.02.03 15:07:01 +0000, Igor Druzhinin wrote:
> When the lock was introduced in 72aabfb862e40 ("drm/i915/gvt: Add mutual
> lock for ppgtt mm LRU list") one place got lost.
> 
> Signed-off-by: Igor Druzhinin <igor.druzhinin@...rix.com>
> ---
>  drivers/gpu/drm/i915/gvt/gtt.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
> index 34cb404..4a48280 100644
> --- a/drivers/gpu/drm/i915/gvt/gtt.c
> +++ b/drivers/gpu/drm/i915/gvt/gtt.c
> @@ -1956,7 +1956,11 @@ void _intel_vgpu_mm_release(struct kref *mm_ref)
>  
>  	if (mm->type == INTEL_GVT_MM_PPGTT) {
>  		list_del(&mm->ppgtt_mm.list);
> +
> +		mutex_lock(&mm->vgpu->gvt->gtt.ppgtt_mm_lock);
>  		list_del(&mm->ppgtt_mm.lru_list);
> +		mutex_unlock(&mm->vgpu->gvt->gtt.ppgtt_mm_lock);
> +
>  		invalidate_ppgtt_mm(mm);
>  	} else {
>  		vfree(mm->ggtt_mm.virtual_ggtt);
> -- 

Thanks for the fix!

Reviewed-by: Zhenyu Wang <zhenyuw@...ux.intel.com>

-- 
Open Source Technology Center, Intel ltd.

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