[bug report] drm/bridge: Add ti-tfp410 DVI transmitter driver

[Dan Carpenter]

Hello Jyri Sarha,

The patch dc55ac3b52e6: "drm/bridge: Add ti-tfp410 DVI transmitter
driver" from Oct 31, 2016, leads to the following static checker
warning:

	drivers/gpu/drm/bridge/ti-tfp410.c:141 tfp410_get_connector_ddc()
	warn: missing error code here? 'of_graph_get_remote_port_parent()' failed.

drivers/gpu/drm/bridge/ti-tfp410.c
   128  static int tfp410_get_connector_ddc(struct tfp410 *dvi)
   129  {
   130          struct device_node *ep = NULL, *connector_node = NULL;
   131          struct device_node *ddc_phandle = NULL;
   132          int ret = 0;
   133  
   134          /* port at 1 is the connector node */
   135          ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
   136          if (!ep)
   137                  goto fail;
                        ^^^^^^^^^
   138  
   139          connector_node = of_graph_get_remote_port_parent(ep);
   140          if (!connector_node)
   141                  goto fail;
                        ^^^^^^^^^


   142  
   143          ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
   144          if (!ddc_phandle)
   145                  goto fail;
                        ^^^^^^^^^

All these goto fails feel like we should be returning an error code.
Otherwise we could change the name to "goto success;"?

   146  
   147          dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle);
   148          if (dvi->ddc)
   149                  dev_info(dvi->dev, "Connector's ddc i2c bus found\n");
   150          else
   151                  ret = -EPROBE_DEFER;
   152  
   153  fail:
   154          of_node_put(ep);
   155          of_node_put(connector_node);
   156          of_node_put(ddc_phandle);
   157          return ret;
   158  }

regards,
dan carpenter