[PATCH] drm: exynos: fix for loosing display mode header during mode adjustment

[Rahul Sharma]

This patch is to preserve the display mode header during the mode adjustment.
Display mode header is overwritten with the adjusted mode header which is
throwing the stack dump.

Signed-off-by: Rahul Sharma <rahul.sharma at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index ee110c9..c7844ea 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -1974,6 +1974,8 @@ static void hdmi_mode_fixup(void *ctx, struct drm_connector *connector,
 {
 	struct drm_display_mode *m;
 	struct hdmi_context *hdata = ctx;
+	struct drm_mode_object base;
+	struct list_head head;
 	int index;
 
 	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
@@ -2002,7 +2004,13 @@ static void hdmi_mode_fixup(void *ctx, struct drm_connector *connector,
 		if (index >= 0) {
 			DRM_INFO("desired mode doesn't exist so\n");
 			DRM_INFO("use the most suitable mode among modes.\n");
+
+			/* preserve display mode header while copying. */
+			head = adjusted_mode->head;
+			base = adjusted_mode->base;
 			memcpy(adjusted_mode, m, sizeof(*m));
+			adjusted_mode->head = head;
+			adjusted_mode->base = base;
 			break;
 		}
 	}
-- 
1.7.0.4