diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 709002515550cd2e6ff989a4c2bdd11b5b0cdf9c..a05ff542be221f051bb338ecb8b549eeffdf94fd 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -34,6 +34,7 @@ #include #include +#include /** * DOC: Reservation Object Overview @@ -95,6 +96,29 @@ static void dma_resv_list_free(struct dma_resv_list *list) kfree_rcu(list, rcu); } +#if IS_ENABLED(CONFIG_LOCKDEP) +static void __init dma_resv_lockdep(void) +{ + struct mm_struct *mm = mm_alloc(); + struct dma_resv obj; + + if (!mm) + return; + + dma_resv_init(&obj); + + down_read(&mm->mmap_sem); + ww_mutex_lock(&obj.lock, NULL); + fs_reclaim_acquire(GFP_KERNEL); + fs_reclaim_release(GFP_KERNEL); + ww_mutex_unlock(&obj.lock); + up_read(&mm->mmap_sem); + + mmput(mm); +} +subsys_initcall(dma_resv_lockdep); +#endif + /** * dma_resv_init - initialize a reservation object * @obj: the reservation object