diff options
| -rw-r--r-- | arch/arm/common/bL_switcher.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c index 00a4ce23d91..fe13ce456af 100644 --- a/arch/arm/common/bL_switcher.c +++ b/arch/arm/common/bL_switcher.c @@ -530,6 +530,25 @@ static int __init bL_switcher_sysfs_init(void) #endif /* CONFIG_SYSFS */ +/* + * Veto any CPU hotplug operation while the switcher is active. + * We're just not ready to deal with that given the trickery involved. + */ +static int bL_switcher_hotplug_callback(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + switch (action) { + case CPU_UP_PREPARE: + case CPU_DOWN_PREPARE: + if (bL_switcher_active) + return NOTIFY_BAD; + } + return NOTIFY_DONE; +} + +static struct notifier_block bL_switcher_hotplug_notifier = + { &bL_switcher_hotplug_callback, NULL, 0 }; + static bool no_bL_switcher; core_param(no_bL_switcher, no_bL_switcher, bool, 0644); @@ -542,6 +561,8 @@ static int __init bL_switcher_init(void) return -EINVAL; } + register_cpu_notifier(&bL_switcher_hotplug_notifier); + if (!no_bL_switcher) { ret = bL_switcher_enable(); if (ret) |