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IB/mlx4: Change vma from shared to private

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[ Upstream commit ca37a664a8 ]

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: ae184ddeca ('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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maor Gottlieb
2017-03-29 06:03:01 +03:00
committed by Greg Kroah-Hartman
parent 0021b4613a
commit df7aedb171
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/hw/mlx4/main.c
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@@ -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;
}