From 136532e7c142f2345493c21c82c6ce4f8981aefe Mon Sep 17 00:00:00 2001 From: Maor Gottlieb Date: Wed, 29 Mar 2017 06:03:01 +0300 Subject: [PATCH] IB/mlx4: Change vma from shared to private [ 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 Signed-off-by: Leon Romanovsky Signed-off-by: Doug Ledford Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- 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 9119e0b..67c4c73 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -1055,6 +1055,8 @@ 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; } -- 2.7.4