[PATCH] drm/amd/display: use vmalloc for struct dc_state

[Alex Deucher]

This is a big structure so use vmalloc as malloc can
fail when there is memory pressure.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3454
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 5d4f831b1e55..080c1d5f7412 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -1491,9 +1491,10 @@ int pre_validate_dsc(struct drm_atomic_state *state,
 	 * from dm_state->context.
 	 */
 
-	local_dc_state = kmemdup(dm_state->context, sizeof(struct dc_state), GFP_KERNEL);
+	local_dc_state = vmalloc(sizeof(struct dc_state));
 	if (!local_dc_state)
 		return -ENOMEM;
+	memcpy(local_dc_state, dm_state->context, sizeof(struct dc_state));
 
 	for (i = 0; i < local_dc_state->stream_count; i++) {
 		struct dc_stream_state *stream = dm_state->context->streams[i];
@@ -1563,7 +1564,7 @@ int pre_validate_dsc(struct drm_atomic_state *state,
 			dc_stream_release(local_dc_state->streams[i]);
 	}
 
-	kfree(local_dc_state);
+	vfree(local_dc_state);
 
 	return ret;
 }
-- 
2.45.2