[ulfh-mmc:devel 6/15] drivers/mmc/host/sdhci-brcmstb.c:302:6: warning: variable 'base_clk' is used uninitialized whenever 'if' condition is true

From: kernel test robot
Date: Thu Jun 02 2022 - 15:30:50 EST

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tree: git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git devel
head: 10980053142d8a3e86eb4d3014574424b42b7a45
commit: 2cecaac1b21c364bdf3639440bf59118ebeee86c [6/15] mmc: sdhci-brcmstb: Add ability to increase max clock rate for 72116b0
config: mips-bmips_stb_defconfig (https://download.01.org/0day-ci/archive/20220603/202206030355.nu0lsR4i-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b364c76683f8ef241025a9556300778c07b590c2)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install mips cross compiling tool for clang build
# apt-get install binutils-mipsel-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git/commit/?id=2cecaac1b21c364bdf3639440bf59118ebeee86c
git remote add ulfh-mmc git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git
git fetch --no-tags ulfh-mmc devel
git checkout 2cecaac1b21c364bdf3639440bf59118ebeee86c
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/mmc/host/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/mmc/host/sdhci-brcmstb.c:302:6: warning: variable 'base_clk' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (res)
^~~
drivers/mmc/host/sdhci-brcmstb.c:376:24: note: uninitialized use occurs here
clk_disable_unprepare(base_clk);
^~~~~~~~
drivers/mmc/host/sdhci-brcmstb.c:302:2: note: remove the 'if' if its condition is always false
if (res)
^~~~~~~~
drivers/mmc/host/sdhci-brcmstb.c:295:6: warning: variable 'base_clk' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (IS_ERR(priv->cfg_regs)) {
^~~~~~~~~~~~~~~~~~~~~~
drivers/mmc/host/sdhci-brcmstb.c:376:24: note: uninitialized use occurs here
clk_disable_unprepare(base_clk);
^~~~~~~~
drivers/mmc/host/sdhci-brcmstb.c:295:2: note: remove the 'if' if its condition is always false
if (IS_ERR(priv->cfg_regs)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/mmc/host/sdhci-brcmstb.c:280:6: warning: variable 'base_clk' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (IS_ERR(host)) {
^~~~~~~~~~~~
drivers/mmc/host/sdhci-brcmstb.c:376:24: note: uninitialized use occurs here
clk_disable_unprepare(base_clk);
^~~~~~~~
drivers/mmc/host/sdhci-brcmstb.c:280:2: note: remove the 'if' if its condition is always false
if (IS_ERR(host)) {
^~~~~~~~~~~~~~~~~~~
drivers/mmc/host/sdhci-brcmstb.c:259:22: note: initialize the variable 'base_clk' to silence this warning
struct clk *base_clk;
^
= NULL
3 warnings generated.

vim +302 drivers/mmc/host/sdhci-brcmstb.c

d46ba2d17f9026 Al Cooper 2020-01-13 247
476bf3d62d5cc0 Al Cooper 2016-06-16 248 static int sdhci_brcmstb_probe(struct platform_device *pdev)
476bf3d62d5cc0 Al Cooper 2016-06-16 249 {
78ab82fdb65c70 Al Cooper 2020-01-13 250 const struct brcmstb_match_priv *match_priv;
d46ba2d17f9026 Al Cooper 2020-01-13 251 struct sdhci_pltfm_data brcmstb_pdata;
476bf3d62d5cc0 Al Cooper 2016-06-16 252 struct sdhci_pltfm_host *pltfm_host;
78ab82fdb65c70 Al Cooper 2020-01-13 253 const struct of_device_id *match;
78ab82fdb65c70 Al Cooper 2020-01-13 254 struct sdhci_brcmstb_priv *priv;
2cecaac1b21c36 Kamal Dasu 2022-05-20 255 u32 actual_clock_mhz;
78ab82fdb65c70 Al Cooper 2020-01-13 256 struct sdhci_host *host;
78ab82fdb65c70 Al Cooper 2020-01-13 257 struct resource *iomem;
476bf3d62d5cc0 Al Cooper 2016-06-16 258 struct clk *clk;
2cecaac1b21c36 Kamal Dasu 2022-05-20 259 struct clk *base_clk;
476bf3d62d5cc0 Al Cooper 2016-06-16 260 int res;
476bf3d62d5cc0 Al Cooper 2016-06-16 261
78ab82fdb65c70 Al Cooper 2020-01-13 262 match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node);
78ab82fdb65c70 Al Cooper 2020-01-13 263 match_priv = match->data;
78ab82fdb65c70 Al Cooper 2020-01-13 264
d46ba2d17f9026 Al Cooper 2020-01-13 265 dev_dbg(&pdev->dev, "Probe found match for %s\n", match->compatible);
d46ba2d17f9026 Al Cooper 2020-01-13 266
b41123f4f57df6 Krzysztof Kozlowski 2020-09-02 267 clk = devm_clk_get_optional(&pdev->dev, NULL);
b41123f4f57df6 Krzysztof Kozlowski 2020-09-02 268 if (IS_ERR(clk))
b41123f4f57df6 Krzysztof Kozlowski 2020-09-02 269 return dev_err_probe(&pdev->dev, PTR_ERR(clk),
b41123f4f57df6 Krzysztof Kozlowski 2020-09-02 270 "Failed to get clock from Device Tree\n");
b41123f4f57df6 Krzysztof Kozlowski 2020-09-02 271
476bf3d62d5cc0 Al Cooper 2016-06-16 272 res = clk_prepare_enable(clk);
476bf3d62d5cc0 Al Cooper 2016-06-16 273 if (res)
476bf3d62d5cc0 Al Cooper 2016-06-16 274 return res;
476bf3d62d5cc0 Al Cooper 2016-06-16 275
d46ba2d17f9026 Al Cooper 2020-01-13 276 memset(&brcmstb_pdata, 0, sizeof(brcmstb_pdata));
d46ba2d17f9026 Al Cooper 2020-01-13 277 brcmstb_pdata.ops = match_priv->ops;
d46ba2d17f9026 Al Cooper 2020-01-13 278 host = sdhci_pltfm_init(pdev, &brcmstb_pdata,
78ab82fdb65c70 Al Cooper 2020-01-13 279 sizeof(struct sdhci_brcmstb_priv));
476bf3d62d5cc0 Al Cooper 2016-06-16 280 if (IS_ERR(host)) {
476bf3d62d5cc0 Al Cooper 2016-06-16 281 res = PTR_ERR(host);
476bf3d62d5cc0 Al Cooper 2016-06-16 282 goto err_clk;
476bf3d62d5cc0 Al Cooper 2016-06-16 283 }
476bf3d62d5cc0 Al Cooper 2016-06-16 284
78ab82fdb65c70 Al Cooper 2020-01-13 285 pltfm_host = sdhci_priv(host);
78ab82fdb65c70 Al Cooper 2020-01-13 286 priv = sdhci_pltfm_priv(pltfm_host);
f3a70f991dd073 Al Cooper 2022-04-27 287 if (device_property_read_bool(&pdev->dev, "supports-cqe")) {
f3a70f991dd073 Al Cooper 2022-04-27 288 priv->flags |= BRCMSTB_PRIV_FLAGS_HAS_CQE;
f3a70f991dd073 Al Cooper 2022-04-27 289 match_priv->ops->irq = sdhci_brcmstb_cqhci_irq;
f3a70f991dd073 Al Cooper 2022-04-27 290 }
78ab82fdb65c70 Al Cooper 2020-01-13 291
78ab82fdb65c70 Al Cooper 2020-01-13 292 /* Map in the non-standard CFG registers */
78ab82fdb65c70 Al Cooper 2020-01-13 293 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
78ab82fdb65c70 Al Cooper 2020-01-13 294 priv->cfg_regs = devm_ioremap_resource(&pdev->dev, iomem);
78ab82fdb65c70 Al Cooper 2020-01-13 295 if (IS_ERR(priv->cfg_regs)) {
78ab82fdb65c70 Al Cooper 2020-01-13 296 res = PTR_ERR(priv->cfg_regs);
78ab82fdb65c70 Al Cooper 2020-01-13 297 goto err;
78ab82fdb65c70 Al Cooper 2020-01-13 298 }
78ab82fdb65c70 Al Cooper 2020-01-13 299
476bf3d62d5cc0 Al Cooper 2016-06-16 300 sdhci_get_of_property(pdev);
1e20186e706da8 Stefan Wahren 2018-12-23 301 res = mmc_of_parse(host->mmc);
1e20186e706da8 Stefan Wahren 2018-12-23 @302 if (res)
1e20186e706da8 Stefan Wahren 2018-12-23 303 goto err;
476bf3d62d5cc0 Al Cooper 2016-06-16 304
6bcc55fe648b86 Al Cooper 2022-04-27 305 /*
6bcc55fe648b86 Al Cooper 2022-04-27 306 * Automatic clock gating does not work for SD cards that may
6bcc55fe648b86 Al Cooper 2022-04-27 307 * voltage switch so only enable it for non-removable devices.
6bcc55fe648b86 Al Cooper 2022-04-27 308 */
6bcc55fe648b86 Al Cooper 2022-04-27 309 if ((match_priv->flags & BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE) &&
6bcc55fe648b86 Al Cooper 2022-04-27 310 (host->mmc->caps & MMC_CAP_NONREMOVABLE))
6bcc55fe648b86 Al Cooper 2022-04-27 311 priv->flags |= BRCMSTB_PRIV_FLAGS_GATE_CLOCK;
6bcc55fe648b86 Al Cooper 2022-04-27 312
78ab82fdb65c70 Al Cooper 2020-01-13 313 /*
78ab82fdb65c70 Al Cooper 2020-01-13 314 * If the chip has enhanced strobe and it's enabled, add
78ab82fdb65c70 Al Cooper 2020-01-13 315 * callback
78ab82fdb65c70 Al Cooper 2020-01-13 316 */
78ab82fdb65c70 Al Cooper 2020-01-13 317 if (match_priv->hs400es &&
78ab82fdb65c70 Al Cooper 2020-01-13 318 (host->mmc->caps2 & MMC_CAP2_HS400_ES))
78ab82fdb65c70 Al Cooper 2020-01-13 319 host->mmc_host_ops.hs400_enhanced_strobe = match_priv->hs400es;
78ab82fdb65c70 Al Cooper 2020-01-13 320
476bf3d62d5cc0 Al Cooper 2016-06-16 321 /*
476bf3d62d5cc0 Al Cooper 2016-06-16 322 * Supply the existing CAPS, but clear the UHS modes. This
476bf3d62d5cc0 Al Cooper 2016-06-16 323 * will allow these modes to be specified by device tree
476bf3d62d5cc0 Al Cooper 2016-06-16 324 * properties through mmc_of_parse().
476bf3d62d5cc0 Al Cooper 2016-06-16 325 */
476bf3d62d5cc0 Al Cooper 2016-06-16 326 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
f3a70f991dd073 Al Cooper 2022-04-27 327 if (match_priv->flags & BRCMSTB_MATCH_FLAGS_NO_64BIT)
6a3d8ced09482b Jaedon Shin 2016-09-09 328 host->caps &= ~SDHCI_CAN_64BIT;
476bf3d62d5cc0 Al Cooper 2016-06-16 329 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
476bf3d62d5cc0 Al Cooper 2016-06-16 330 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
476bf3d62d5cc0 Al Cooper 2016-06-16 331 SDHCI_SUPPORT_DDR50);
78ab82fdb65c70 Al Cooper 2020-01-13 332 host->quirks |= SDHCI_QUIRK_MISSING_CAPS;
78ab82fdb65c70 Al Cooper 2020-01-13 333
f3a70f991dd073 Al Cooper 2022-04-27 334 if (match_priv->flags & BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT)
78ab82fdb65c70 Al Cooper 2020-01-13 335 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
476bf3d62d5cc0 Al Cooper 2016-06-16 336
2cecaac1b21c36 Kamal Dasu 2022-05-20 337 /* Change the base clock frequency if the DT property exists */
2cecaac1b21c36 Kamal Dasu 2022-05-20 338 if (device_property_read_u32(&pdev->dev, "clock-frequency",
2cecaac1b21c36 Kamal Dasu 2022-05-20 339 &priv->base_freq_hz) != 0)
2cecaac1b21c36 Kamal Dasu 2022-05-20 340 goto add_host;
2cecaac1b21c36 Kamal Dasu 2022-05-20 341
2cecaac1b21c36 Kamal Dasu 2022-05-20 342 base_clk = devm_clk_get_optional(&pdev->dev, "sdio_freq");
2cecaac1b21c36 Kamal Dasu 2022-05-20 343 if (IS_ERR(base_clk)) {
2cecaac1b21c36 Kamal Dasu 2022-05-20 344 dev_warn(&pdev->dev, "Clock for \"sdio_freq\" not found\n");
2cecaac1b21c36 Kamal Dasu 2022-05-20 345 goto add_host;
2cecaac1b21c36 Kamal Dasu 2022-05-20 346 }
2cecaac1b21c36 Kamal Dasu 2022-05-20 347
2cecaac1b21c36 Kamal Dasu 2022-05-20 348 res = clk_prepare_enable(base_clk);
2cecaac1b21c36 Kamal Dasu 2022-05-20 349 if (res)
2cecaac1b21c36 Kamal Dasu 2022-05-20 350 goto err;
2cecaac1b21c36 Kamal Dasu 2022-05-20 351
2cecaac1b21c36 Kamal Dasu 2022-05-20 352 /* set improved clock rate */
2cecaac1b21c36 Kamal Dasu 2022-05-20 353 clk_set_rate(base_clk, priv->base_freq_hz);
2cecaac1b21c36 Kamal Dasu 2022-05-20 354 actual_clock_mhz = clk_get_rate(base_clk) / 1000000;
2cecaac1b21c36 Kamal Dasu 2022-05-20 355
2cecaac1b21c36 Kamal Dasu 2022-05-20 356 host->caps &= ~SDHCI_CLOCK_V3_BASE_MASK;
2cecaac1b21c36 Kamal Dasu 2022-05-20 357 host->caps |= (actual_clock_mhz << SDHCI_CLOCK_BASE_SHIFT);
2cecaac1b21c36 Kamal Dasu 2022-05-20 358 /* Disable presets because they are now incorrect */
2cecaac1b21c36 Kamal Dasu 2022-05-20 359 host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
2cecaac1b21c36 Kamal Dasu 2022-05-20 360
2cecaac1b21c36 Kamal Dasu 2022-05-20 361 dev_dbg(&pdev->dev, "Base Clock Frequency changed to %dMHz\n",
2cecaac1b21c36 Kamal Dasu 2022-05-20 362 actual_clock_mhz);
2cecaac1b21c36 Kamal Dasu 2022-05-20 363 priv->base_clk = base_clk;
2cecaac1b21c36 Kamal Dasu 2022-05-20 364
2cecaac1b21c36 Kamal Dasu 2022-05-20 365 add_host:
d46ba2d17f9026 Al Cooper 2020-01-13 366 res = sdhci_brcmstb_add_host(host, priv);
476bf3d62d5cc0 Al Cooper 2016-06-16 367 if (res)
476bf3d62d5cc0 Al Cooper 2016-06-16 368 goto err;
476bf3d62d5cc0 Al Cooper 2016-06-16 369
476bf3d62d5cc0 Al Cooper 2016-06-16 370 pltfm_host->clk = clk;
476bf3d62d5cc0 Al Cooper 2016-06-16 371 return res;
476bf3d62d5cc0 Al Cooper 2016-06-16 372
476bf3d62d5cc0 Al Cooper 2016-06-16 373 err:
476bf3d62d5cc0 Al Cooper 2016-06-16 374 sdhci_pltfm_free(pdev);
476bf3d62d5cc0 Al Cooper 2016-06-16 375 err_clk:
2cecaac1b21c36 Kamal Dasu 2022-05-20 376 clk_disable_unprepare(base_clk);
476bf3d62d5cc0 Al Cooper 2016-06-16 377 clk_disable_unprepare(clk);
476bf3d62d5cc0 Al Cooper 2016-06-16 378 return res;
476bf3d62d5cc0 Al Cooper 2016-06-16 379 }
476bf3d62d5cc0 Al Cooper 2016-06-16 380

:::::: The code at line 302 was first introduced by commit
:::::: 1e20186e706da8446f9435f2924cd65ab1397e73 mmc: sdhci-brcmstb: handle mmc_of_parse() errors during probe

:::::: TO: Stefan Wahren <stefan.wahren@xxxxxxxx>
:::::: CC: Ulf Hansson <ulf.hansson@xxxxxxxxxx>

--
0-DAY CI Kernel Test Service
https://01.org/lkp

Next message: Luis Chamberlain: "Re: [PATCH v9 1/6] LICENSES: Add the copyleft-next-0.3.1 license"
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