IB/mlx5: Change vma from shared to private

Anonymous VMA (->vm_ops == NULL) cannot be shared, otherwise
it would lead to SIGBUS.

Remove the shared flags from the vma after we change it to be
anonymous.

This is easily reproduced by doing modprobe -r while running a
user-space application such as raw_ethernet_bw.

Fixes: 7c2344c3bbf97 ('IB/mlx5: Implements disassociate_ucontext API')
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 88070a7..3ecb3c3 100644 (file)
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1488,6 +1488,7 @@ static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
                /* context going to be destroyed, should
                 * not access ops any more.
                 */
+               vma->vm_flags &= ~(VM_SHARED | VM_MAYSHARE);
                vma->vm_ops = NULL;
                list_del(&vma_private->list);
                kfree(vma_private);