linux-kernel - Re: [PATCH 1/2] drm/rcar-du: Use common error handling code in rcar_du_encoders

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Date:   Thu, 26 Oct 2017 20:40:24 +0800
From:   kbuild test robot <lkp@...el.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     kbuild-all@...org, dri-devel@...ts.freedesktop.org,
        linux-renesas-soc@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] drm/rcar-du: Use common error handling code in
 rcar_du_encoders_init()

Hi Markus,

[auto build test ERROR on drm/drm-next]
[also build test ERROR on v4.14-rc6 next-20171018]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/SF-Markus-Elfring/R-Car-Display-Unit-Fine-tuning-for-some-function-implementations/20171026-160928
base:   git://people.freedesktop.org/~airlied/linux.git drm-next
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm64 

All error/warnings (new ones prefixed by >>):

   drivers/gpu/drm/rcar-du/rcar_du_kms.c: In function 'rcar_du_encoders_init':
>> drivers/gpu/drm/rcar-du/rcar_du_kms.c:415:9: error: 'ret' undeclared (first use in this function)
     return ret;
            ^~~
   drivers/gpu/drm/rcar-du/rcar_du_kms.c:415:9: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/gpu/drm/rcar-du/rcar_du_kms.c:416:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +/ret +415 drivers/gpu/drm/rcar-du/rcar_du_kms.c

   362	
   363	static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
   364	{
   365		struct device_node *np = rcdu->dev->of_node;
   366		struct device_node *ep_node;
   367		unsigned int num_encoders = 0;
   368	
   369		/*
   370		 * Iterate over the endpoints and create one encoder for each output
   371		 * pipeline.
   372		 */
   373		for_each_endpoint_of_node(np, ep_node) {
   374			enum rcar_du_output output;
   375			struct of_endpoint ep;
   376			unsigned int i;
   377			int ret;
   378	
   379			ret = of_graph_parse_endpoint(ep_node, &ep);
   380			if (ret < 0)
   381				goto put_node;
   382	
   383			/* Find the output route corresponding to the port number. */
   384			for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
   385				if (rcdu->info->routes[i].possible_crtcs &&
   386				    rcdu->info->routes[i].port == ep.port) {
   387					output = i;
   388					break;
   389				}
   390			}
   391	
   392			if (i == RCAR_DU_OUTPUT_MAX) {
   393				dev_warn(rcdu->dev,
   394					 "port %u references unexisting output, skipping\n",
   395					 ep.port);
   396				continue;
   397			}
   398	
   399			/* Process the output pipeline. */
   400			ret = rcar_du_encoders_init_one(rcdu, output, &ep);
   401			if (ret < 0) {
   402				if (ret == -EPROBE_DEFER)
   403					goto put_node;
   404	
   405				continue;
   406			}
   407	
   408			num_encoders++;
   409		}
   410	
   411		return num_encoders;
   412	
   413	put_node:
   414		of_node_put(ep_node);
 > 415		return ret;
 > 416	}
   417	

---
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