IB/mlx5: Take write semaphore when changing the vma struct
authorMaor Gottlieb <maorg@mellanox.com>
Wed, 29 Mar 2017 03:03:02 +0000 (06:03 +0300)
committerDoug Ledford <dledford@redhat.com>
Fri, 21 Apr 2017 16:26:05 +0000 (12:26 -0400)
commitecc7d83be3243835c9396a1a2fb8ce95f205207b
tree974b9d74fec90fb7532383312f2b5330a353e363
parentca37a664a8e4e9988b220988ceb4d79e3316f195
IB/mlx5: Take write semaphore when changing the vma struct

When the driver disassociate user context, it changes the vma to
anonymous by setting the vm_ops to null and zap the vma ptes.

In order to avoid race in the kernel, we need to take write lock
before we change the vma entries.

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>
drivers/infiniband/hw/mlx5/main.c