diff options
Diffstat (limited to 'drivers/infiniband/hw/mlx5/odp.c')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/odp.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c index 7d2ec9ee5097..1ab676b66894 100644 --- a/drivers/infiniband/hw/mlx5/odp.c +++ b/drivers/infiniband/hw/mlx5/odp.c @@ -601,6 +601,23 @@ void mlx5_ib_free_implicit_mr(struct mlx5_ib_mr *imr) */ synchronize_srcu(&dev->odp_srcu); + /* + * All work on the prefetch list must be completed, xa_erase() prevented + * new work from being created. + */ + wait_event(imr->q_deferred_work, !atomic_read(&imr->num_deferred_work)); + + /* + * At this point it is forbidden for any other thread to enter + * pagefault_mr() on this imr. It is already forbidden to call + * pagefault_mr() on an implicit child. Due to this additions to + * implicit_children are prevented. + */ + + /* + * Block destroy_unused_implicit_child_mr() from incrementing + * num_deferred_work. + */ xa_lock(&imr->implicit_children); xa_for_each (&imr->implicit_children, idx, mtt) { __xa_erase(&imr->implicit_children, idx); @@ -609,9 +626,8 @@ void mlx5_ib_free_implicit_mr(struct mlx5_ib_mr *imr) xa_unlock(&imr->implicit_children); /* - * num_deferred_work can only be incremented inside the odp_srcu, or - * under xa_lock while the child is in the xarray. Thus at this point - * it is only decreasing, and all work holding it is now on the wq. + * Wait for any concurrent destroy_unused_implicit_child_mr() to + * complete. */ wait_event(imr->q_deferred_work, !atomic_read(&imr->num_deferred_work)); |