| From | Sasha Levin <> | Subject | [PATCH AUTOSEL for 4.9 065/190] IB/mlx4: Change vma from shared to private | Date | Thu, 8 Mar 2018 04:59:20 +0000 |
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From: Maor Gottlieb <maorg@mellanox.com>
[ Upstream commit ca37a664a8e4e9988b220988ceb4d79e3316f195 ]
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: ae184ddeca5db ('IB/mlx4_ib: Disassociate support') Signed-off-by: Maor Gottlieb <maorg@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> --- drivers/infiniband/hw/mlx4/main.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index 129dbd790dba..19bc1c2186ff 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -1182,6 +1182,8 @@ static void mlx4_ib_disassociate_ucontext(struct ib_ucontext *ibcontext) BUG_ON(1); } + context->hw_bar_info[i].vma->vm_flags &= + ~(VM_SHARED | VM_MAYSHARE); /* context going to be destroyed, should not access ops any more */ context->hw_bar_info[i].vma->vm_ops = NULL; } -- 2.14.1
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