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

Message ID 20241201-drm-connector-eld-mutex-v1-9-ba56a6545c03@linaro.org
State New
Headers show
Series drm/connector: add eld_mutex to protect connector->eld | expand

Commit Message

Dmitry Baryshkov Nov. 30, 2024, 11:55 p.m. UTC 
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@linaro.org>
---
 drivers/gpu/drm/sti/sti_hdmi.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Raphaël Gallais-Pou Dec. 2, 2024, 3:03 p.m. UTC | #1 
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@linaro.org>

Hi Dmitry,

Acked-by: Raphael Gallais-Pou <rgallaispou@gmail.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;
>   }
>
diff mbox series

Patch

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;
 }