disp: msm: Address static analysis issues

Avoid various possible nullptr dereferences.
Addresses various issues highlighted by static analysis.

Change-Id: I36d34d610b37bf2799a7e34cd1de8b909b5c0ae4
Signed-off-by: Nisarg Bhavsar <quic_bhavsar@quicinc.com>

msm/dp/dp_lphw_hpd.c

@@ -345,7 +345,7 @@ struct dp_hpd *dp_lphw_hpd_get(struct device *dev, struct dp_parser *parser,
 {
 	int rc = 0;
 	const char *hpd_gpio_name = "qcom,dp-hpd-gpio";
-	struct dp_lphw_hpd_private *lphw_hpd;
+	struct dp_lphw_hpd_private *lphw_hpd = NULL;
 	unsigned int gpio;
 
 	if (!dev || !parser || !cb) {
@@ -358,7 +358,7 @@ struct dp_hpd *dp_lphw_hpd_get(struct device *dev, struct dp_parser *parser,
 	if (!gpio_is_valid(gpio)) {
 		DP_DEBUG("%s gpio not specified\n", hpd_gpio_name);
 		rc = -EINVAL;
-		goto gpio_error;
+		goto error;
 	}
 
 	lphw_hpd = devm_kzalloc(dev, sizeof(*lphw_hpd), GFP_KERNEL);

msm/dsi/dsi_drm.c

@@ -621,7 +621,7 @@ int dsi_conn_get_mode_info(struct drm_connector *connector,
 
 	convert_to_dsi_mode(drm_mode, &partial_dsi_mode);
 	rc = dsi_display_find_mode(dsi_display, &partial_dsi_mode, sub_mode, &dsi_mode);
-	if (rc || !dsi_mode->priv_info)
+	if (rc || !dsi_mode->priv_info || !dsi_display || !dsi_display->panel)
 		return -EINVAL;
 
 	memset(mode_info, 0, sizeof(*mode_info));
@@ -641,12 +641,12 @@ int dsi_conn_get_mode_info(struct drm_connector *connector,
 	mode_info->qsync_min_fps = dsi_mode->timing.qsync_min_fps;
 	mode_info->wd_jitter = dsi_mode->priv_info->wd_jitter;
 
-	if (dsi_display->panel)
-		mode_info->vpadding = dsi_display->panel->host_config.vpadding;
+	mode_info->vpadding = dsi_display->panel->host_config.vpadding;
 	if (mode_info->vpadding < drm_mode->vdisplay) {
 		mode_info->vpadding = 0;
 		dsi_display->panel->host_config.line_insertion_enable = 0;
 	}
+
 	memcpy(&mode_info->topology, &dsi_mode->priv_info->topology,
 			sizeof(struct msm_display_topology));
 

msm/sde/sde_color_processing.c

@@ -1652,6 +1652,12 @@ static void _sde_cp_crtc_commit_feature(struct sde_cp_node *prop_node,
 	struct sde_mdss_cfg *catalog = NULL;
 	struct sde_crtc_state *sde_crtc_state;
 
+	sde_crtc_state = to_sde_crtc_state(sde_crtc->base.state);
+	if (!sde_crtc_state) {
+		DRM_ERROR("sde_crtc_state is null\n");
+		return;
+	}
+
 	memset(&hw_cfg, 0, sizeof(hw_cfg));
 	_sde_cp_get_cached_payload(prop_node, &hw_cfg, &feature_enabled);
 	hw_cfg.num_of_mixers = sde_crtc->num_mixers;
@@ -1663,11 +1669,6 @@ static void _sde_cp_crtc_commit_feature(struct sde_cp_node *prop_node,
 	hw_cfg.skip_blend_plane_h = sde_crtc->skip_blend_plane_h;
 	hw_cfg.skip_blend_plane_w = sde_crtc->skip_blend_plane_w;
 
-	sde_crtc_state = to_sde_crtc_state(sde_crtc->base.state);
-	if (!sde_crtc_state) {
-		DRM_ERROR("invalid sde_crtc_state %pK\n", sde_crtc_state);
-		return;
-	}
 	hw_cfg.num_ds_enabled = sde_crtc_state->num_ds_enabled;
 
 	SDE_EVT32(hw_cfg.panel_width, hw_cfg.panel_height);

msm/sde/sde_connector.c

@@ -3136,7 +3136,8 @@ static int _sde_connector_install_properties(struct drm_device *dev,
 		msm_property_install_enum(&c_conn->property_info, "dsc_mode", 0,
 			0, e_dsc_mode, ARRAY_SIZE(e_dsc_mode), 0, CONNECTOR_PROP_DSC_MODE);
 
-		if (display_info->capabilities & MSM_DISPLAY_CAP_CMD_MODE &&
+		if (dsi_display && dsi_display->panel &&
+			display_info->capabilities & MSM_DISPLAY_CAP_CMD_MODE &&
 			display_info->capabilities & MSM_DISPLAY_CAP_VID_MODE)
 			msm_property_install_enum(&c_conn->property_info,
 			"panel_mode", 0, 0,

msm/sde/sde_crtc.c

@@ -3711,7 +3711,7 @@ bool sde_crtc_is_line_insertion_supported(struct drm_crtc *crtc)
 		return false;
 
 	kms = _sde_crtc_get_kms(crtc);
-	if (!kms->catalog->has_line_insertion)
+	if (!kms || !kms->catalog || !kms->catalog->has_line_insertion)
 		return false;
 
 	list_for_each_entry(enc, &crtc->dev->mode_config.encoder_list, head) {

msm/sde/sde_encoder_phys_wb.c

@@ -1091,6 +1091,11 @@ static void _sde_encoder_phys_wb_setup_sys_cache(struct sde_encoder_phys *phys_e
 		return;
 	}
 
+	if (!hw_wb || !hw_wb->ops.setup_sys_cache) {
+		SDE_DEBUG("unsupported ops: setup_sys_cache WB %d\n", WBID(wb_enc));
+		return;
+	}
+
 	/*
 	 * - use LLCC_DISP for cwb static display
 	 * - use LLCC_DISP_1 for cwb static display read path only
@@ -1113,11 +1118,6 @@ static void _sde_encoder_phys_wb_setup_sys_cache(struct sde_encoder_phys *phys_e
 		return;
 	}
 
-	if (!hw_wb || !hw_wb->ops.setup_sys_cache) {
-		SDE_DEBUG("unsupported ops: setup_sys_cache WB %d\n", WBID(wb_enc));
-		return;
-	}
-
 	cache_enable = sde_connector_get_property(state, CONNECTOR_PROP_CACHE_STATE);
 
 	if (!cfg->wr_en && !cache_enable)