Re: [PATCH v18 03/10] soc: mediatek: add mtk-mmsys support for mt8195 vdosys0

From: Dan Carpenter
Date: Wed Apr 13 2022 - 02:08:18 EST

Hi "jason-jh.lin",

url: https://github.com/intel-lab-lkp/linux/commits/jason-jh-lin/Add-Mediatek-Soc-DRM-vdosys0-support-for-mt8195/20220412-183359
base: git://anongit.freedesktop.org/drm/drm drm-next
config: arc-randconfig-m031-20220411 (https://download.01.org/0day-ci/archive/20220413/202204130935.urqkcDrG-lkp@xxxxxxxxx/config)
compiler: arc-elf-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
drivers/soc/mediatek/mtk-mmsys.c:315 mtk_mmsys_probe() warn: passing zero to 'PTR_ERR'

vim +/PTR_ERR +315 drivers/soc/mediatek/mtk-mmsys.c

13032709e23285 Matthias Brugger 2020-03-25 281 static int mtk_mmsys_probe(struct platform_device *pdev)
13032709e23285 Matthias Brugger 2020-03-25 282 {
2c758e301ed95a Enric Balletbo i Serra 2020-03-25 283 struct device *dev = &pdev->dev;
13032709e23285 Matthias Brugger 2020-03-25 284 struct platform_device *clks;
667c769246b01c Enric Balletbo i Serra 2020-03-25 285 struct platform_device *drm;
8cfc54a36d3e79 jason-jh.lin 2022-04-12 286 const struct mtk_mmsys_match_data *match_data;
ce15e7faa2fc54 CK Hu 2021-03-17 287 struct mtk_mmsys *mmsys;
8cfc54a36d3e79 jason-jh.lin 2022-04-12 288 struct resource *res;
2c758e301ed95a Enric Balletbo i Serra 2020-03-25 289 int ret;
2c758e301ed95a Enric Balletbo i Serra 2020-03-25 290
ce15e7faa2fc54 CK Hu 2021-03-17 291 mmsys = devm_kzalloc(dev, sizeof(*mmsys), GFP_KERNEL);
ce15e7faa2fc54 CK Hu 2021-03-17 292 if (!mmsys)
ce15e7faa2fc54 CK Hu 2021-03-17 293 return -ENOMEM;
ce15e7faa2fc54 CK Hu 2021-03-17 294
ce15e7faa2fc54 CK Hu 2021-03-17 295 mmsys->regs = devm_platform_ioremap_resource(pdev, 0);
ce15e7faa2fc54 CK Hu 2021-03-17 296 if (IS_ERR(mmsys->regs)) {
ce15e7faa2fc54 CK Hu 2021-03-17 297 ret = PTR_ERR(mmsys->regs);
cc6576029aedc7 Enric Balletbo i Serra 2020-10-06 298 dev_err(dev, "Failed to ioremap mmsys registers: %d\n", ret);
2c758e301ed95a Enric Balletbo i Serra 2020-03-25 299 return ret;
2c758e301ed95a Enric Balletbo i Serra 2020-03-25 300 }
2c758e301ed95a Enric Balletbo i Serra 2020-03-25 301
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 302 spin_lock_init(&mmsys->lock);
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 303
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 304 mmsys->rcdev.owner = THIS_MODULE;
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 305 mmsys->rcdev.nr_resets = 32;
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 306 mmsys->rcdev.ops = &mtk_mmsys_reset_ops;
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 307 mmsys->rcdev.of_node = pdev->dev.of_node;
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 308 ret = devm_reset_controller_register(&pdev->dev, &mmsys->rcdev);
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 309 if (ret) {
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 310 dev_err(&pdev->dev, "Couldn't register mmsys reset controller: %d\n", ret);
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 311 return ret;
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 312 }
f27ef2856343e2 Enric Balletbo i Serra 2021-09-30 313
8cfc54a36d3e79 jason-jh.lin 2022-04-12 314 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
8cfc54a36d3e79 jason-jh.lin 2022-04-12 @315 if (PTR_ERR(res)) {

You probably meant IS_ERR() instead of PTR_ERR(). But actually
platform_get_resource() does not return error pointers, it returns
NULL so the correct check is:

if (!res) {

8cfc54a36d3e79 jason-jh.lin 2022-04-12 316 dev_err(dev, "Couldn't get mmsys resource\n");
8cfc54a36d3e79 jason-jh.lin 2022-04-12 317 return -EINVAL;
8cfc54a36d3e79 jason-jh.lin 2022-04-12 318 }
8cfc54a36d3e79 jason-jh.lin 2022-04-12 319 mmsys->io_start = res->start;
8cfc54a36d3e79 jason-jh.lin 2022-04-12 320
8cfc54a36d3e79 jason-jh.lin 2022-04-12 321 match_data = of_device_get_match_data(dev);
8cfc54a36d3e79 jason-jh.lin 2022-04-12 322 if (match_data->num_drv_data > 1) {
8cfc54a36d3e79 jason-jh.lin 2022-04-12 323 /* This SoC has multiple mmsys channels */
8cfc54a36d3e79 jason-jh.lin 2022-04-12 324 ret = mtk_mmsys_find_match_drvdata(mmsys, match_data);
8cfc54a36d3e79 jason-jh.lin 2022-04-12 325 if (ret < 0) {
8cfc54a36d3e79 jason-jh.lin 2022-04-12 326 dev_err(dev, "Couldn't get match driver data\n");
8cfc54a36d3e79 jason-jh.lin 2022-04-12 327 return ret;
8cfc54a36d3e79 jason-jh.lin 2022-04-12 328 }
8cfc54a36d3e79 jason-jh.lin 2022-04-12 329 mmsys->data = match_data->drv_data[ret];
8cfc54a36d3e79 jason-jh.lin 2022-04-12 330 } else {
8cfc54a36d3e79 jason-jh.lin 2022-04-12 331 dev_dbg(dev, "Using single mmsys channel\n");
8cfc54a36d3e79 jason-jh.lin 2022-04-12 332 mmsys->data = match_data->drv_data[0];
8cfc54a36d3e79 jason-jh.lin 2022-04-12 333 }
8cfc54a36d3e79 jason-jh.lin 2022-04-12 334
ce15e7faa2fc54 CK Hu 2021-03-17 335 platform_set_drvdata(pdev, mmsys);
13032709e23285 Matthias Brugger 2020-03-25 336
ce15e7faa2fc54 CK Hu 2021-03-17 337 clks = platform_device_register_data(&pdev->dev, mmsys->data->clk_driver,
13032709e23285 Matthias Brugger 2020-03-25 338 PLATFORM_DEVID_AUTO, NULL, 0);
13032709e23285 Matthias Brugger 2020-03-25 339 if (IS_ERR(clks))
13032709e23285 Matthias Brugger 2020-03-25 340 return PTR_ERR(clks);
13032709e23285 Matthias Brugger 2020-03-25 341
667c769246b01c Enric Balletbo i Serra 2020-03-25 342 drm = platform_device_register_data(&pdev->dev, "mediatek-drm",
667c769246b01c Enric Balletbo i Serra 2020-03-25 343 PLATFORM_DEVID_AUTO, NULL, 0);
ff34e17cf9bce8 Wei Yongjun 2020-05-06 344 if (IS_ERR(drm)) {
ff34e17cf9bce8 Wei Yongjun 2020-05-06 345 platform_device_unregister(clks);
667c769246b01c Enric Balletbo i Serra 2020-03-25 346 return PTR_ERR(drm);
ff34e17cf9bce8 Wei Yongjun 2020-05-06 347 }
667c769246b01c Enric Balletbo i Serra 2020-03-25 348
13032709e23285 Matthias Brugger 2020-03-25 349 return 0;
13032709e23285 Matthias Brugger 2020-03-25 350 }

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