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    Subject[PATCH 1/4][RFC v2] PM / sleep: Avoid accessing frozen_cpus if it is NULL
    Date
    frozen_cpus might be NULL if the allocation in previous
    alloc_frozen_cpus failed, when CONFIG_CPUMASK_OFFSTACK
    is set.

    This patch avoid accessing this cpumask if it is NULL.

    Signed-off-by: Chen Yu <yu.c.chen@intel.com>
    ---
    kernel/cpu.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/kernel/cpu.c b/kernel/cpu.c
    index d948e44..d25266e 100644
    --- a/kernel/cpu.c
    +++ b/kernel/cpu.c
    @@ -1021,6 +1021,8 @@ int disable_nonboot_cpus(void)
    {
    int cpu, first_cpu, error = 0;

    + if (frozen_cpus == NULL)
    + return -ENOMEM;
    cpu_maps_update_begin();
    first_cpu = cpumask_first(cpu_online_mask);
    /*
    @@ -1072,6 +1074,8 @@ void enable_nonboot_cpus(void)
    {
    int cpu, error;

    + if (frozen_cpus == NULL)
    + return;
    /* Allow everyone to use the CPU hotplug again */
    cpu_maps_update_begin();
    WARN_ON(--cpu_hotplug_disabled < 0);
    --
    2.7.4
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