Commit ca37a664 authored Mar 29, 2017 by Maor Gottlieb Committed by Doug Ledford Apr 21, 2017

IB/mlx4: 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: ae184dde ('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>

parent 22c3653d

drivers/infiniband/hw/mlx4/main.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1187,6 +1187,8 @@ 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;
		}

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