Re: [PATCH 2/8] drm/panel: do not return negative error codes from drm_panel_get_modes()

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On 3/8/2024 8:03 AM, Jani Nikula wrote:
None of the callers of drm_panel_get_modes() expect it to return
negative error codes. Either they propagate the return value in their
struct drm_connector_helper_funcs .get_modes() hook (which is also not
supposed to return negative codes), or add it to other counts leading to
bogus values.

On the other hand, many of the struct drm_panel_funcs .get_modes() hooks
do return negative error codes, so handle them gracefully instead of
propagating further.

Return 0 for no modes, whatever the reason.

Cc: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Cc: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
  drivers/gpu/drm/drm_panel.c | 17 +++++++++++------
  1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index e814020bbcd3..cfbe020de54e 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -274,19 +274,24 @@ EXPORT_SYMBOL(drm_panel_disable);
   * The modes probed from the panel are automatically added to the connector
   * that the panel is attached to.
   *
- * Return: The number of modes available from the panel on success or a
- * negative error code on failure.
+ * Return: The number of modes available from the panel on success, or 0 on
+ * failure (no modes).
   */
  int drm_panel_get_modes(struct drm_panel *panel,
  			struct drm_connector *connector)
  {
  	if (!panel)
-		return -EINVAL;
+		return 0;
- if (panel->funcs && panel->funcs->get_modes)
-		return panel->funcs->get_modes(panel, connector);
+	if (panel->funcs && panel->funcs->get_modes) {
+		int num;
- return -EOPNOTSUPP;
+		num = panel->funcs->get_modes(panel, connector);
+		if (num > 0)
+			return num;

Hi Jani,

The change LGTM:

Reviewed-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>

Thanks,

Jessica Zhang

+	}
+
+	return 0;
  }
  EXPORT_SYMBOL(drm_panel_get_modes);
--
2.39.2




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