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author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-06-24 14:41:41 +0200 |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-06-24 19:07:53 +0200 |
commit | 816724e65c72a90a44fbad0ef0b59b186c85fa90 (patch) | |
tree | 421fa29aedff988e392f92780637553e275d37a0 /drivers/cpufreq/cpufreq_ondemand.c | |
parent | Merge branch 'master' of /home/trondmy/kernel/linux-2.6/ (diff) | |
parent | [PATCH] fix typo in acpi video brightness changes. (diff) | |
download | linux-816724e65c72a90a44fbad0ef0b59b186c85fa90.tar.xz linux-816724e65c72a90a44fbad0ef0b59b186c85fa90.zip |
Merge branch 'master' of /home/trondmy/kernel/linux-2.6/
Conflicts:
fs/nfs/inode.c
fs/super.c
Fix conflicts between patch 'NFS: Split fs/nfs/inode.c' and patch
'VFS: Permit filesystem to override root dentry on mount'
Diffstat (limited to 'drivers/cpufreq/cpufreq_ondemand.c')
-rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 3e6ffcaa5af4..693e540481b4 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -21,6 +21,7 @@ #include <linux/types.h> #include <linux/fs.h> #include <linux/sysfs.h> +#include <linux/cpu.h> #include <linux/sched.h> #include <linux/kmod.h> #include <linux/workqueue.h> @@ -71,6 +72,14 @@ static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info); static unsigned int dbs_enable; /* number of CPUs using this policy */ +/* + * DEADLOCK ALERT! There is a ordering requirement between cpu_hotplug + * lock and dbs_mutex. cpu_hotplug lock should always be held before + * dbs_mutex. If any function that can potentially take cpu_hotplug lock + * (like __cpufreq_driver_target()) is being called with dbs_mutex taken, then + * cpu_hotplug lock should be taken before that. Note that cpu_hotplug lock + * is recursive for the same process. -Venki + */ static DEFINE_MUTEX (dbs_mutex); static DECLARE_WORK (dbs_work, do_dbs_timer, NULL); @@ -363,12 +372,14 @@ static void dbs_check_cpu(int cpu) static void do_dbs_timer(void *data) { int i; + lock_cpu_hotplug(); mutex_lock(&dbs_mutex); for_each_online_cpu(i) dbs_check_cpu(i); queue_delayed_work(dbs_workq, &dbs_work, usecs_to_jiffies(dbs_tuners_ins.sampling_rate)); mutex_unlock(&dbs_mutex); + unlock_cpu_hotplug(); } static inline void dbs_timer_init(void) @@ -469,6 +480,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, break; case CPUFREQ_GOV_LIMITS: + lock_cpu_hotplug(); mutex_lock(&dbs_mutex); if (policy->max < this_dbs_info->cur_policy->cur) __cpufreq_driver_target( @@ -479,6 +491,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, this_dbs_info->cur_policy, policy->min, CPUFREQ_RELATION_L); mutex_unlock(&dbs_mutex); + unlock_cpu_hotplug(); break; } return 0; |