From d8996f63abe5a9d9b24f7a4df2c8459659d0e76f Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Tue, 27 Aug 2013 11:47:29 -0700 Subject: cpufreq: Fix timer/workqueue corruption due to double queueing commit 3617f2ca6d0eba48114308532945a7f1577816a4 upstream. When a CPU is hot removed we'll cancel all the delayed work items via gov_cancel_work(). Normally this will just cancels a delayed timer on each CPU that the policy is managing and the work won't run, but if the work is already running the workqueue code will wait for the work to finish before continuing to prevent the work items from re-queuing themselves like they normally do. This scheme will work most of the time, except for the case where the work function determines that it should adjust the delay for all other CPUs that the policy is managing. If this scenario occurs, the canceling CPU will cancel its own work but queue up the other CPUs works to run. For example: CPU0 CPU1 ---- ---- cpu_down() ... __cpufreq_remove_dev() cpufreq_governor_dbs() case CPUFREQ_GOV_STOP: gov_cancel_work(dbs_data, policy); cpu0 work is canceled timer is canceled cpu1 work is canceled od_dbs_timer() gov_queue_work(*, *, true); cpu0 work queued cpu1 work queued cpu2 work queued ... cpu1 work is canceled cpu2 work is canceled ... At the end of the GOV_STOP case cpu0 still has a work queued to run although the code is expecting all of the works to be canceled. __cpufreq_remove_dev() will then proceed to re-initialize all the other CPUs works except for the CPU that is going down. The CPUFREQ_GOV_START case in cpufreq_governor_dbs() will trample over the queued work and debugobjects will spit out a warning: WARNING: at lib/debugobjects.c:260 debug_print_object+0x94/0xbc() ODEBUG: init active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x10 Modules linked in: CPU: 0 PID: 1491 Comm: sh Tainted: G W 3.10.0 #19 [] (unwind_backtrace+0x0/0x11c) from [] (show_stack+0x10/0x14) [] (show_stack+0x10/0x14) from [] (warn_slowpath_common+0x4c/0x6c) [] (warn_slowpath_common+0x4c/0x6c) from [] (warn_slowpath_fmt+0x2c/0x3c) [] (warn_slowpath_fmt+0x2c/0x3c) from [] (debug_print_object+0x94/0xbc) [] (debug_print_object+0x94/0xbc) from [] (__debug_object_init+0x2d0/0x340) [] (__debug_object_init+0x2d0/0x340) from [] (init_timer_key+0x14/0xb0) [] (init_timer_key+0x14/0xb0) from [] (cpufreq_governor_dbs+0x3e8/0x5f8) [] (cpufreq_governor_dbs+0x3e8/0x5f8) from [] (__cpufreq_governor+0xdc/0x1a4) [] (__cpufreq_governor+0xdc/0x1a4) from [] (__cpufreq_remove_dev.isra.10+0x3b4/0x434) [] (__cpufreq_remove_dev.isra.10+0x3b4/0x434) from [] (cpufreq_cpu_callback+0x60/0x80) [] (cpufreq_cpu_callback+0x60/0x80) from [] (notifier_call_chain+0x38/0x68) [] (notifier_call_chain+0x38/0x68) from [] (__cpu_notify+0x28/0x40) [] (__cpu_notify+0x28/0x40) from [] (_cpu_down+0x7c/0x2c0) [] (_cpu_down+0x7c/0x2c0) from [] (cpu_down+0x24/0x40) [] (cpu_down+0x24/0x40) from [] (store_online+0x2c/0x74) [] (store_online+0x2c/0x74) from [] (dev_attr_store+0x18/0x24) [] (dev_attr_store+0x18/0x24) from [] (sysfs_write_file+0x100/0x148) [] (sysfs_write_file+0x100/0x148) from [] (vfs_write+0xcc/0x174) [] (vfs_write+0xcc/0x174) from [] (SyS_write+0x38/0x64) [] (SyS_write+0x38/0x64) from [] (ret_fast_syscall+0x0/0x30) Signed-off-by: Stephen Boyd Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki Cc: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman --- drivers/cpufreq/cpufreq_governor.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c index a86ff72141f3..28a0b32c73b3 100644 --- a/drivers/cpufreq/cpufreq_governor.c +++ b/drivers/cpufreq/cpufreq_governor.c @@ -177,6 +177,9 @@ void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy, { int i; + if (!policy->governor_enabled) + return; + if (!all_cpus) { __gov_queue_work(smp_processor_id(), dbs_data, delay); } else { -- cgit v1.2.3