[PATCH 07/21] drm/amd/display: Fix up coverity issues

[sunpeng.li at amd.com]

From: Aric Cyr <aric.cyr at amd.com>

[Why]
Coverity found various high-impact issues that need resolving.

[How]
Fix  some buffer overruns and uninitialized variables.

Signed-off-by: Aric Cyr <aric.cyr at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/dc/bios/bios_parser.c           | 2 +-
 drivers/gpu/drm/amd/display/dc/core/dc_debug.c              | 7 +++----
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 6 +++---
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
index 0e1dc1b..c2ab026 100644
--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
@@ -2030,7 +2030,7 @@ static uint32_t get_src_obj_list(struct bios_parser *bp, ATOM_OBJECT *object,
 static struct device_id device_type_from_device_id(uint16_t device_id)
 {
 
-	struct device_id result_device_id;
+	struct device_id result_device_id = {0};
 
 	switch (device_id) {
 	case ATOM_DEVICE_LCD1_SUPPORT:
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_debug.c b/drivers/gpu/drm/amd/display/dc/core/dc_debug.c
index e1ebdf7..73d0495 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_debug.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_debug.c
@@ -311,7 +311,7 @@ void context_timing_trace(
 {
 	int i;
 	struct dc  *core_dc = dc;
-	int h_pos[MAX_PIPES], v_pos[MAX_PIPES];
+	int h_pos[MAX_PIPES] = {0}, v_pos[MAX_PIPES] = {0};
 	struct crtc_position position;
 	unsigned int underlay_idx = core_dc->res_pool->underlay_pipe_index;
 	DC_LOGGER_INIT(dc->ctx->logger);
@@ -322,8 +322,7 @@ void context_timing_trace(
 		/* get_position() returns CRTC vertical/horizontal counter
 		 * hence not applicable for underlay pipe
 		 */
-		if (pipe_ctx->stream == NULL
-				 || pipe_ctx->pipe_idx == underlay_idx)
+		if (pipe_ctx->stream == NULL || pipe_ctx->pipe_idx == underlay_idx)
 			continue;
 
 		pipe_ctx->stream_res.tg->funcs->get_position(pipe_ctx->stream_res.tg, &position);
@@ -333,7 +332,7 @@ void context_timing_trace(
 	for (i = 0; i < core_dc->res_pool->pipe_count; i++) {
 		struct pipe_ctx *pipe_ctx = &res_ctx->pipe_ctx[i];
 
-		if (pipe_ctx->stream == NULL)
+		if (pipe_ctx->stream == NULL || pipe_ctx->pipe_idx == underlay_idx)
 			continue;
 
 		TIMING_TRACE("OTG_%d   H_tot:%d  V_tot:%d   H_pos:%d  V_pos:%d\n",
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index e8c3620..de3c327 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -548,14 +548,14 @@ dce110_translate_regamma_to_hw_format(const struct dc_transfer_func *output_tf,
 
 	regamma_params->hw_points_num = hw_points;
 
-	i = 1;
-	for (k = 0; k < 16 && i < 16; k++) {
+	k = 0;
+	for (i = 1; i < 16; i++) {
 		if (seg_distr[k] != -1) {
 			regamma_params->arr_curve_points[k].segments_num = seg_distr[k];
 			regamma_params->arr_curve_points[i].offset =
 					regamma_params->arr_curve_points[k].offset + (1 << seg_distr[k]);
 		}
-		i++;
+		k++;
 	}
 
 	if (seg_distr[k] != -1)
-- 
2.7.4