[PATCH 25/25] drm/amd/display: Add check for num of entries in gamma

[Bhawanpreet Lakha]

From: Vitaly Prosyak <vitaly.prosyak at amd.com>

This check avoids potential bugs related to gamma.

Change-Id: I5610b0dd27dd5e12cea51791424227983f9273c2
Signed-off-by: Vitaly Prosyak <vitaly.prosyak at amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
index 3d1b89a30b3b..15427f4fc990 100644
--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
+++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
@@ -1580,7 +1580,8 @@ bool mod_color_calculate_degamma_params(struct dc_transfer_func *input_tf,
 	/* we can use hardcoded curve for plain SRGB TF */
 	if (input_tf->type == TF_TYPE_PREDEFINED &&
 			input_tf->tf == TRANSFER_FUNCTION_SRGB &&
-			(!mapUserRamp && ramp->type == GAMMA_RGB_256))
+			(!mapUserRamp &&
+			(ramp->type == GAMMA_RGB_256 || ramp->num_entries == 0)))
 		return true;
 
 	input_tf->type = TF_TYPE_DISTRIBUTED_POINTS;
-- 
2.14.1