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[rdma-next,2/4] IB/mlx4: Change vma from shared to private

Message ID 20170329030303.4942-2-leon@kernel.org (mailing list archive)
State Accepted
Headers show

Commit Message

Leon Romanovsky March 29, 2017, 3:03 a.m. UTC 
From: Maor Gottlieb <maorg@mellanox.com>

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>
---
 drivers/infiniband/hw/mlx4/main.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index a2c9629f63d0..e6efc7c34c9a 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -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;
 	}