[PATCH v3 1/3] cpufreq: mediatek: using global lock avoid race condition
Dan Carpenter
dan.carpenter at linaro.org
Tue Feb 18 23:23:36 PST 2025
Hi Mark,
kernel test robot noticed the following build warnings:
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Mark-Tseng/cpufreq-mediatek-using-global-lock-avoid-race-condition/20250214-154521
base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link: https://lore.kernel.org/r/20250214074353.1169864-2-chun-jen.tseng%40mediatek.com
patch subject: [PATCH v3 1/3] cpufreq: mediatek: using global lock avoid race condition
config: sparc-randconfig-r071-20250218 (https://download.01.org/0day-ci/archive/20250219/202502190807.fz6fs2jz-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 14.2.0
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Reported-by: Dan Carpenter <dan.carpenter at linaro.org>
| Closes: https://lore.kernel.org/r/202502190807.fz6fs2jz-lkp@intel.com/
smatch warnings:
drivers/cpufreq/mediatek-cpufreq.c:367 mtk_cpufreq_opp_notifier() warn: inconsistent returns 'global &mtk_policy_lock'.
vim +367 drivers/cpufreq/mediatek-cpufreq.c
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 317 static int mtk_cpufreq_opp_notifier(struct notifier_block *nb,
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 318 unsigned long event, void *data)
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 319 {
5f81d7eeae239d drivers/cpufreq/mediatek-cpufreq.c Mark Tseng 2025-02-14 320 struct dev_pm_opp *opp;
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 321 struct dev_pm_opp *new_opp;
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 322 struct mtk_cpu_dvfs_info *info;
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 323 unsigned long freq, volt;
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 324 struct cpufreq_policy *policy;
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 325 int ret = 0;
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 326
5f81d7eeae239d drivers/cpufreq/mediatek-cpufreq.c Mark Tseng 2025-02-14 327 mutex_lock(&mtk_policy_lock);
5f81d7eeae239d drivers/cpufreq/mediatek-cpufreq.c Mark Tseng 2025-02-14 328 opp = data;
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 329 info = container_of(nb, struct mtk_cpu_dvfs_info, opp_nb);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 330
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 331 if (event == OPP_EVENT_ADJUST_VOLTAGE) {
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 332 freq = dev_pm_opp_get_freq(opp);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 333
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 334 if (info->current_freq == freq) {
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 335 volt = dev_pm_opp_get_voltage(opp);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 336 ret = mtk_cpufreq_set_voltage(info, volt);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 337 if (ret)
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 338 dev_err(info->cpu_dev,
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 339 "failed to scale voltage: %d\n", ret);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 340 }
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 341 } else if (event == OPP_EVENT_DISABLE) {
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 342 freq = dev_pm_opp_get_freq(opp);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 343
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 344 /* case of current opp item is disabled */
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 345 if (info->current_freq == freq) {
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 346 freq = 1;
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 347 new_opp = dev_pm_opp_find_freq_ceil(info->cpu_dev,
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 348 &freq);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 349 if (IS_ERR(new_opp)) {
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 350 dev_err(info->cpu_dev,
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 351 "all opp items are disabled\n");
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 352 ret = PTR_ERR(new_opp);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 353 return notifier_from_errno(ret);
mutex_unlock(&mtk_policy_lock) before returning.
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 354 }
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 355
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 356 dev_pm_opp_put(new_opp);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 357 policy = cpufreq_cpu_get(info->opp_cpu);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 358 if (policy) {
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 359 cpufreq_driver_target(policy, freq / 1000,
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 360 CPUFREQ_RELATION_L);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 361 cpufreq_cpu_put(policy);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 362 }
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 363 }
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 364 }
5f81d7eeae239d drivers/cpufreq/mediatek-cpufreq.c Mark Tseng 2025-02-14 365 mutex_unlock(&mtk_policy_lock);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 366
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 @367 return notifier_from_errno(ret);
c210063b40acab drivers/cpufreq/mediatek-cpufreq.c Rex-BC Chen 2022-05-05 368 }
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