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    SubjectRe: [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

    ---
    0-DAY kernel test infrastructure Open Source Technology Center
    https://lists.01.org/pipermail/kbuild-all Intel Corporation
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