cpufreq.c (f339f3541701d824a0256ad4bf14c26ceb6d79c3) cpufreq.c (d4627a287e251efed59f2b4bda82c5950768c963)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/cpufreq/cpufreq.c
4 *
5 * Copyright (C) 2001 Russell King
6 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
7 * (C) 2013 Viresh Kumar <viresh.kumar@linaro.org>
8 *

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943
944#define to_policy(k) container_of(k, struct cpufreq_policy, kobj)
945#define to_attr(a) container_of(a, struct freq_attr, attr)
946
947static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
948{
949 struct cpufreq_policy *policy = to_policy(kobj);
950 struct freq_attr *fattr = to_attr(attr);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/cpufreq/cpufreq.c
4 *
5 * Copyright (C) 2001 Russell King
6 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
7 * (C) 2013 Viresh Kumar <viresh.kumar@linaro.org>
8 *

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943
944#define to_policy(k) container_of(k, struct cpufreq_policy, kobj)
945#define to_attr(a) container_of(a, struct freq_attr, attr)
946
947static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
948{
949 struct cpufreq_policy *policy = to_policy(kobj);
950 struct freq_attr *fattr = to_attr(attr);
951 ssize_t ret;
951 ssize_t ret = -EBUSY;
952
953 if (!fattr->show)
954 return -EIO;
955
956 down_read(&policy->rwsem);
952
953 if (!fattr->show)
954 return -EIO;
955
956 down_read(&policy->rwsem);
957 ret = fattr->show(policy, buf);
957 if (likely(!policy_is_inactive(policy)))
958 ret = fattr->show(policy, buf);
958 up_read(&policy->rwsem);
959
960 return ret;
961}
962
963static ssize_t store(struct kobject *kobj, struct attribute *attr,
964 const char *buf, size_t count)
965{
966 struct cpufreq_policy *policy = to_policy(kobj);
967 struct freq_attr *fattr = to_attr(attr);
959 up_read(&policy->rwsem);
960
961 return ret;
962}
963
964static ssize_t store(struct kobject *kobj, struct attribute *attr,
965 const char *buf, size_t count)
966{
967 struct cpufreq_policy *policy = to_policy(kobj);
968 struct freq_attr *fattr = to_attr(attr);
968 ssize_t ret = -EINVAL;
969 ssize_t ret = -EBUSY;
969
970 if (!fattr->store)
971 return -EIO;
972
973 /*
974 * cpus_read_trylock() is used here to work around a circular lock
975 * dependency problem with respect to the cpufreq_register_driver().
976 */
977 if (!cpus_read_trylock())
978 return -EBUSY;
979
980 if (cpu_online(policy->cpu)) {
981 down_write(&policy->rwsem);
970
971 if (!fattr->store)
972 return -EIO;
973
974 /*
975 * cpus_read_trylock() is used here to work around a circular lock
976 * dependency problem with respect to the cpufreq_register_driver().
977 */
978 if (!cpus_read_trylock())
979 return -EBUSY;
980
981 if (cpu_online(policy->cpu)) {
982 down_write(&policy->rwsem);
982 ret = fattr->store(policy, buf, count);
983 if (likely(!policy_is_inactive(policy)))
984 ret = fattr->store(policy, buf, count);
983 up_write(&policy->rwsem);
984 }
985
986 cpus_read_unlock();
987
988 return ret;
989}
990

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1530 pr_debug("initialization complete\n");
1531
1532 return 0;
1533
1534out_destroy_policy:
1535 for_each_cpu(j, policy->real_cpus)
1536 remove_cpu_dev_symlink(policy, j, get_cpu_device(j));
1537
985 up_write(&policy->rwsem);
986 }
987
988 cpus_read_unlock();
989
990 return ret;
991}
992

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1532 pr_debug("initialization complete\n");
1533
1534 return 0;
1535
1536out_destroy_policy:
1537 for_each_cpu(j, policy->real_cpus)
1538 remove_cpu_dev_symlink(policy, j, get_cpu_device(j));
1539
1540 cpumask_clear(policy->cpus);
1538 up_write(&policy->rwsem);
1539
1540out_offline_policy:
1541 if (cpufreq_driver->offline)
1542 cpufreq_driver->offline(policy);
1543
1544out_exit_policy:
1545 if (cpufreq_driver->exit)

--- 1406 unchanged lines hidden --- 		1541 up_write(&policy->rwsem);
1542
1543out_offline_policy:
1544 if (cpufreq_driver->offline)
1545 cpufreq_driver->offline(policy);
1546
1547out_exit_policy:
1548 if (cpufreq_driver->exit)

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