Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Tue, 8 Nov 2022 17:01:05 +0100
From:   Daniel Vetter <daniel@ffwll.ch>
To:     =?iso-8859-1?Q?Ma=EDra?= Canal <mcanal@igalia.com>
Cc:     Melissa Wen <mwen@igalia.com>, Emma Anholt <emma@anholt.net>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        =?iso-8859-1?Q?Andr=E9?= Almeida <andrealmeid@igalia.com>,
        "Juan A . Suarez" <jasuarez@igalia.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] drm/v3d: add missing mutex_destroy
Message-ID: <Y2p9QX2r+0MoY1+C@phenom.ffwll.local>
Mail-Followup-To: =?iso-8859-1?Q?Ma=EDra?= Canal <mcanal@igalia.com>,
        Melissa Wen <mwen@igalia.com>, Emma Anholt <emma@anholt.net>,
        David Airlie <airlied@gmail.com>,
        =?iso-8859-1?Q?Andr=E9?= Almeida <andrealmeid@igalia.com>,
        "Juan A . Suarez" <jasuarez@igalia.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
References: <20221107224656.278135-1-mcanal@igalia.com>
 <20221107224656.278135-3-mcanal@igalia.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20221107224656.278135-3-mcanal@igalia.com>
Precedence: bulk

On Mon, Nov 07, 2022 at 07:46:56PM -0300, Ma?ra Canal wrote:
> v3d_perfmon_open_file() instantiates a mutex for a particular file
> instance, but it never destroys it by calling mutex_destroy() in
> v3d_perfmon_close_file().
> 
> Similarly, v3d_perfmon_create_ioctl() instantiates a mutex for a
> particular perfmon, but it never destroys it by calling mutex_destroy()
> in v3d_perfmon_destroy_ioctl().
> 
> So, add the missing mutex_destroy on both cases.
> 
> Signed-off-by: Ma?ra Canal <mcanal@igalia.com>
> ---
>  drivers/gpu/drm/v3d/v3d_perfmon.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/v3d/v3d_perfmon.c b/drivers/gpu/drm/v3d/v3d_perfmon.c
> index 48aaaa972c49..292c73544255 100644
> --- a/drivers/gpu/drm/v3d/v3d_perfmon.c
> +++ b/drivers/gpu/drm/v3d/v3d_perfmon.c
> @@ -113,6 +113,7 @@ void v3d_perfmon_close_file(struct v3d_file_priv *v3d_priv)
>  	idr_for_each(&v3d_priv->perfmon.idr, v3d_perfmon_idr_del, NULL);
>  	idr_destroy(&v3d_priv->perfmon.idr);
>  	mutex_unlock(&v3d_priv->perfmon.lock);
> +	mutex_destroy(&v3d_priv->perfmon.lock);
>  }
>  
>  int v3d_perfmon_create_ioctl(struct drm_device *dev, void *data,
> @@ -177,6 +178,7 @@ int v3d_perfmon_destroy_ioctl(struct drm_device *dev, void *data,
>  	if (!perfmon)
>  		return -EINVAL;
>  
> +	mutex_destroy(&perfmon->lock);

This one looks wrong, I think this should be put into v3d_perfmon_put.
There is also an error case in v3d_perfmon_create_ioctl() that I think you
missed, right above the kfree(perfmon).

With these two fixes this is Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>


>  	v3d_perfmon_put(perfmon);
>  
>  	return 0;
> -- 
> 2.38.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch