From 6afde10c3f58cc3ac593f5b4505b8b1cf719f5d6 Mon Sep 17 00:00:00 2001 From: Thomas Renninger Date: Tue, 2 Oct 2007 13:28:13 -0700 Subject: [CPUFREQ] Only check for transition latency on problematic governors (kconfig fix) Cc: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Dave Jones --- drivers/cpufreq/cpufreq.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 418522f88f7..65ac5851122 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)) -- cgit v1.2.3