diff options
| -rw-r--r-- | include/linux/clockchips.h | 3 | ||||
| -rw-r--r-- | kernel/time/clockevents.c | 1 | ||||
| -rw-r--r-- | kernel/time/tick-broadcast.c | 3 | ||||
| -rw-r--r-- | kernel/time/tick-common.c | 4 |
4 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index 2f498f66c1bb..ae1193bcf074 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -30,6 +30,7 @@ enum clock_event_nofitiers { #include <linux/notifier.h> struct clock_event_device; +struct module; /* Clock event mode commands */ enum clock_event_mode { @@ -83,6 +84,7 @@ enum clock_event_mode { * @irq: IRQ number (only for non CPU local devices) * @cpumask: cpumask to indicate for which CPUs this device works * @list: list head for the management code + * @owner: module reference */ struct clock_event_device { void (*event_handler)(struct clock_event_device *); @@ -112,6 +114,7 @@ struct clock_event_device { int irq; const struct cpumask *cpumask; struct list_head list; + struct module *owner; } ____cacheline_aligned; /* diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index 0e3a8448e115..89e394caa769 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -357,6 +357,7 @@ void clockevents_exchange_device(struct clock_event_device *old, * released list and do a notify add later. */ if (old) { + module_put(old->owner); clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED); list_del(&old->list); list_add(&old->list, &clockevents_released); diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index 3500caaa0bfd..0e374cd2e0ef 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -19,6 +19,7 @@ #include <linux/profile.h> #include <linux/sched.h> #include <linux/smp.h> +#include <linux/module.h> #include "tick-internal.h" @@ -73,6 +74,8 @@ void tick_install_broadcast_device(struct clock_event_device *dev) tick_broadcast_device.evtdev->rating >= dev->rating) || (dev->features & CLOCK_EVT_FEAT_C3STOP)) return; + if (!try_module_get(dev->owner)) + return; clockevents_exchange_device(tick_broadcast_device.evtdev, dev); if (cur) diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c index 84c7cfca4d7d..433a1e11d13b 100644 --- a/kernel/time/tick-common.c +++ b/kernel/time/tick-common.c @@ -18,6 +18,7 @@ #include <linux/percpu.h> #include <linux/profile.h> #include <linux/sched.h> +#include <linux/module.h> #include <asm/irq_regs.h> @@ -257,6 +258,9 @@ void tick_check_new_device(struct clock_event_device *newdev) goto out_bc; } + if (!try_module_get(newdev->owner)) + return; + /* * Replace the eventually existing device by the new * device. If the current device is the broadcast device, do |