diff options
| author | Tim Gardner <tim.gardner@canonical.com> | 2012-04-24 11:47:18 -0600 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2012-08-15 23:46:01 -0600 |
| commit | 7d2690599442d8e36817c1b43fb41c31236f0faf (patch) | |
| tree | 5f9969bae3fc2ae8eab2d217cdbf3e7776aa6f04 /drivers | |
| parent | 33a7ce3a5ea68e907f9d312c8d3648c6bcae3866 (diff) | |
UBUNTU: SAUCE: Allow filtering of cpufreq drivers
BugLink: http://bugs.launchpad.net/bugs/984288
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Herton Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Diffstat (limited to 'drivers')
| -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 fb8a5279c5d..0513e7faf13 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1836,6 +1836,20 @@ 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# @@ -1858,7 +1872,13 @@ 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; |