From: Moni Shoua monis@mellanox.com
[ Upstream commit 1abe186ed8a6593069bc122da55fc684383fdc1c ]
If page-fault handler spans multiple MRs then the access mask needs to be reset before each MR handling or otherwise write access will be granted to mapped pages instead of read-only.
Cc: stable@vger.kernel.org # 3.19 Fixes: 7bdf65d411c1 ("IB/mlx5: Handle page faults") Reported-by: Jerome Glisse jglisse@redhat.com Signed-off-by: Moni Shoua monis@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/mlx5/odp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c index 9e1cac8cb2609..453e5c4ac19f4 100644 --- a/drivers/infiniband/hw/mlx5/odp.c +++ b/drivers/infiniband/hw/mlx5/odp.c @@ -497,7 +497,7 @@ void mlx5_ib_free_implicit_mr(struct mlx5_ib_mr *imr) static int pagefault_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr, u64 io_virt, size_t bcnt, u32 *bytes_mapped) { - u64 access_mask = ODP_READ_ALLOWED_BIT; + u64 access_mask; int npages = 0, page_shift, np; u64 start_idx, page_mask; struct ib_umem_odp *odp; @@ -522,6 +522,7 @@ static int pagefault_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr, page_shift = mr->umem->page_shift; page_mask = ~(BIT(page_shift) - 1); start_idx = (io_virt - (mr->mmkey.iova & page_mask)) >> page_shift; + access_mask = ODP_READ_ALLOWED_BIT;
if (mr->umem->writable) access_mask |= ODP_WRITE_ALLOWED_BIT;