From mboxrd@z Thu Jan 1 00:00:00 1970 From: Leon Romanovsky Subject: [PATCH rdma-next 2/4] IB/mlx4: Change vma from shared to private Date: Wed, 29 Mar 2017 06:03:01 +0300 Message-ID: <20170329030303.4942-2-leon@kernel.org> References: <20170329030303.4942-1-leon@kernel.org> Return-path: In-Reply-To: <20170329030303.4942-1-leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Doug Ledford Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Maor Gottlieb List-Id: linux-rdma@vger.kernel.org From: Maor Gottlieb 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 Signed-off-by: Leon Romanovsky --- 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 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; } -- 2.12.0 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html