diff --git a/drivers/base/core.c b/drivers/base/core.c index 8c25e68e67d7354005dc81a92342eb10519449ed..3050e6f994031ffb308976eb8dd19a6a07cb2b28 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -638,6 +638,11 @@ int lock_device_hotplug_sysfs(void) return restart_syscall(); } +void assert_held_device_hotplug(void) +{ + lockdep_assert_held(&device_hotplug_lock); +} + #ifdef CONFIG_BLOCK static inline int device_is_not_partition(struct device *dev) { diff --git a/include/linux/device.h b/include/linux/device.h index bd684fc8ec1d83b80f393e9b2e5dc5cfb0776ad6..a48a7ff70164beee58f086fa6dca79e88bb6344a 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1139,6 +1139,7 @@ static inline bool device_supports_offline(struct device *dev) extern void lock_device_hotplug(void); extern void unlock_device_hotplug(void); extern int lock_device_hotplug_sysfs(void); +void assert_held_device_hotplug(void); extern int device_offline(struct device *dev); extern int device_online(struct device *dev); extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index d67787d10ff0e9c4e068beb819daf4761947be04..92a242af5a917cf3a4312785b259151bec83fb67 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -126,6 +126,8 @@ void put_online_mems(void) void mem_hotplug_begin(void) { + assert_held_device_hotplug(); + mem_hotplug.active_writer = current; memhp_lock_acquire();