linux-kernel - Re: [PATCH 09/10] drm/sti: hdmi: use eld_mutex to protect access to connector->eld

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Message-ID: <0eb908f2-2304-4a91-9c91-e7f291da9dcd@gmail.com>
Date: Mon, 2 Dec 2024 16:03:42 +0100
From: Raphaël Gallais-Pou <rgallaispou@...il.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
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Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 amd-gfx@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
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 freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 09/10] drm/sti: hdmi: use eld_mutex to protect access to
 connector->eld



Le 01/12/2024 à 00:55, Dmitry Baryshkov a écrit :
> Reading access to connector->eld can happen at the same time the
> drm_edid_to_eld() updates the data. Take the newly added eld_mutex in
> order to protect connector->eld from concurrent access.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Hi Dmitry,

Acked-by: Raphael Gallais-Pou <rgallaispou@...il.com>

Thanks,
Raphaël
> ---
>   drivers/gpu/drm/sti/sti_hdmi.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
> index 847470f747c0efad61c2ebdc3fb3746a7a13a863..3c8f3532c79723e7b1a720c855c90e40584cc6ca 100644
> --- a/drivers/gpu/drm/sti/sti_hdmi.c
> +++ b/drivers/gpu/drm/sti/sti_hdmi.c
> @@ -1225,7 +1225,9 @@ static int hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf, size
>   	struct drm_connector *connector = hdmi->drm_connector;
>   
>   	DRM_DEBUG_DRIVER("\n");
> +	mutex_lock(&connector->eld_mutex);
>   	memcpy(buf, connector->eld, min(sizeof(connector->eld), len));
> +	mutex_unlock(&connector->eld_mutex);
>   
>   	return 0;
>   }
>