In current code loop_add() is called from loop_probe(), loop_control_ioctl(), and loop_init(). Each of these functions hold global mutex lock loop_ctrl_mutex with two variants mutex_lock() and mutex_lock_killable(). Add lockdep_asset_lock_held() in loop_add() to make sure it will generate an appropriate error message in case of misuse. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx> --- drivers/block/loop.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 578fc034db3f..3bfdcabaf6b1 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -2081,6 +2081,8 @@ static int loop_add(struct loop_device **l, int i) struct gendisk *disk; int err; + lockdep_assert_held(&loop_ctl_mutex); + err = -ENOMEM; lo = kzalloc(sizeof(*lo), GFP_KERNEL); if (!lo) -- 2.22.1
