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| author | Lianwei Wang <lianwei.wang@gmail.com> | 2016-06-10 08:43:28 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-09-02 20:37:17 +0200 |
| commit | 01b41159066531cc8d664362ff0cd89dd137bbfa (patch) | |
| tree | ae1514bb4d6e3a845d4b5159629ac730119b4bd8 /kernel/cpu.c | |
| parent | net/virtio-net: Convert to hotplug state machine (diff) | |
| download | linux-01b41159066531cc8d664362ff0cd89dd137bbfa.tar.xz linux-01b41159066531cc8d664362ff0cd89dd137bbfa.zip | |
cpu/hotplug: Handle unbalanced hotplug enable/disable
When cpu_hotplug_enable() is called unbalanced w/o a preceeding
cpu_hotplug_disable() the code emits a warning, but happily decrements the
disabled counter. This causes the next operations to malfunction.
Prevent the decrement and just emit a warning.
Signed-off-by: Lianwei Wang <lianwei.wang@gmail.com>
Cc: peterz@infradead.org
Cc: linux-pm@vger.kernel.org
Cc: oleg@redhat.com
Link: http://lkml.kernel.org/r/1465541008-12476-1-git-send-email-lianwei.wang@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index c506485eaa75..c90f839c5b86 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -331,10 +331,17 @@ void cpu_hotplug_disable(void) } EXPORT_SYMBOL_GPL(cpu_hotplug_disable); +static void __cpu_hotplug_enable(void) +{ + if (WARN_ONCE(!cpu_hotplug_disabled, "Unbalanced cpu hotplug enable\n")) + return; + cpu_hotplug_disabled--; +} + void cpu_hotplug_enable(void) { cpu_maps_update_begin(); - WARN_ON(--cpu_hotplug_disabled < 0); + __cpu_hotplug_enable(); cpu_maps_update_done(); } EXPORT_SYMBOL_GPL(cpu_hotplug_enable); @@ -1160,7 +1167,7 @@ void enable_nonboot_cpus(void) /* Allow everyone to use the CPU hotplug again */ cpu_maps_update_begin(); - WARN_ON(--cpu_hotplug_disabled < 0); + __cpu_hotplug_enable(); if (cpumask_empty(frozen_cpus)) goto out; |