Showing error 915

User: Jiri Slaby
Error type: Double Lock
Error type description: Some lock is locked twice unintentionally in a sequence
File location: kernel/sched.c
Line in file: 9342
Project: Linux Kernel
Project version: 2.6.28
Tools: Undetermined 1
Entered: 2012-02-27 21:22:42 UTC

Source: 

9312        for_each_possible_cpu(i) {
9313                u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
9314
9315                /*
9316                 * Take rq->lock to make 64-bit addition safe on 32-bit
9317                 * platforms.
9318                 */
9319                spin_lock_irq(&cpu_rq(i)->lock);
9320                totalcpuusage += *cpuusage;
9321                spin_unlock_irq(&cpu_rq(i)->lock);
9322        }
9323
9324        return totalcpuusage;
9325}
9326
9327static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype,
9328                                                                u64 reset)
9329{
9330        struct cpuacct *ca = cgroup_ca(cgrp);
9331        int err = 0;
9332        int i;
9333
9334        if (reset) {
9335                err = -EINVAL;
9336                goto out;
9337        }
9338
9339        for_each_possible_cpu(i) {
9340                u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
9341
9342                spin_lock_irq(&cpu_rq(i)->lock);
9343                *cpuusage = 0;
9344                spin_unlock_irq(&cpu_rq(i)->lock);
9345        }
9346out:
9347        return err;
9348}
9349
9350static struct cftype files[] = {
9351        {
9352                .name = "usage",
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