From: Harry Wentland <harry.wentland@amd.com>
Date: Fri, 10 Nov 2017 20:35:27 -0500
Subject: drm/amd/display: Fix couple more inconsistent NULL checks in
 dc_resource
Git-commit: e41ab0309a1b75d31c360d1d2b0de58e8d7958ad
Patch-mainline: v4.15-rc2
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1001
acquire_free_pipe_for_stream() error: we previously assumed 'head_pipe'
could be null (see line 998)
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1808
dc_validate_global_state() error: we previously assumed 'new_ctx' could
be null (see line 1778)

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -993,8 +993,10 @@ static struct pipe_ctx *acquire_free_pip
 
 	head_pipe = resource_get_head_pipe_for_stream(res_ctx, stream);
 
-	if (!head_pipe)
+	if (!head_pipe) {
 		ASSERT(0);
+		return NULL;
+	}
 
 	if (!head_pipe->plane_state)
 		return head_pipe;
@@ -1772,13 +1774,16 @@ enum dc_status dc_validate_global_state(
 	enum dc_status result = DC_ERROR_UNEXPECTED;
 	int i, j;
 
+	if (!new_ctx)
+		return DC_ERROR_UNEXPECTED;
+
 	if (dc->res_pool->funcs->validate_global) {
 			result = dc->res_pool->funcs->validate_global(dc, new_ctx);
 			if (result != DC_OK)
 				return result;
 	}
 
-	for (i = 0; new_ctx && i < new_ctx->stream_count; i++) {
+	for (i = 0; i < new_ctx->stream_count; i++) {
 		struct dc_stream_state *stream = new_ctx->streams[i];
 
 		for (j = 0; j < dc->res_pool->pipe_count; j++) {