diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 7f2f149ae40f..222966f34432 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1817,6 +1817,20 @@ static struct notifier_block __refdata cpufreq_cpu_notifier = { * REGISTER / UNREGISTER CPUFREQ DRIVER * *********************************************************************/ +static char cpufreq_driver_name[CPUFREQ_NAME_LEN]; + +static int __init cpufreq_driver_setup(char *str) +{ + strlcpy(cpufreq_driver_name, str, CPUFREQ_NAME_LEN); + return 1; +} + +/* + * Set this name to only allow one specific cpu freq driver, e.g., + * cpufreq_driver=powernow-k8 + */ +__setup("cpufreq_driver=", cpufreq_driver_setup); + /** * cpufreq_register_driver - register a CPU Frequency driver * @driver_data: A struct cpufreq_driver containing the values# @@ -1839,7 +1853,13 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) ((!driver_data->setpolicy) && (!driver_data->target))) return -EINVAL; - pr_debug("trying to register driver %s\n", driver_data->name); + pr_debug("trying to register driver %s, cpufreq_driver=%s\n", + driver_data->name, cpufreq_driver_name); + + if (cpufreq_driver_name[0]) + if (!driver_data->name || + strcmp(cpufreq_driver_name, driver_data->name)) + return -EINVAL; if (driver_data->setpolicy) driver_data->flags |= CPUFREQ_CONST_LOOPS; |