diff options
| author | Thomas Renninger <trenn@suse.de> | 2007-10-03 00:28:13 +0400 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2007-10-05 02:40:57 +0400 |
| commit | 6afde10c3f58cc3ac593f5b4505b8b1cf719f5d6 (patch) | |
| tree | 28f8d8af521abb7186836bd7003cec237907b79a /drivers/cpufreq/cpufreq.c | |
| parent | 1c2562459faedc35927546cfa5273ec6c2884cce (diff) | |
| download | linux-6afde10c3f58cc3ac593f5b4505b8b1cf719f5d6.tar.xz | |
[CPUFREQ] Only check for transition latency on problematic governors (kconfig fix)
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 418522f88f73..65ac58511228 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1484,17 +1484,30 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event) { int ret; - struct cpufreq_governor *gov = CPUFREQ_PERFORMANCE_GOVERNOR; + + /* Only must be defined when default governor is known to have latency + restrictions, like e.g. conservative or ondemand. + That this is the case is already ensured in Kconfig + */ +#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE + struct cpufreq_governor *gov = &cpufreq_gov_performance; +#else + struct cpufreq_governor *gov = NULL; +#endif if (policy->governor->max_transition_latency && policy->cpuinfo.transition_latency > policy->governor->max_transition_latency) { - printk(KERN_WARNING "%s governor failed, too long" - " transition latency of HW, fallback" - " to %s governor\n", - policy->governor->name, - gov->name); - policy->governor = gov; + if (!gov) + return -EINVAL; + else { + printk(KERN_WARNING "%s governor failed, too long" + " transition latency of HW, fallback" + " to %s governor\n", + policy->governor->name, + gov->name); + policy->governor = gov; + } } if (!try_module_get(policy->governor->owner)) |