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net/mlx4_en: use READ_ONCE when freeing xdp_prog

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For consistency, and in order to hint at the synchronous nature of the
xdp_prog field, use READ_ONCE in the destroy path of the ring. All
occurrences should now use either READ_ONCE or xchg.

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Brenden Blanco 2016-07-20 17:22:33 -07:00 committed by David S. Miller
parent f67fe5c80b
commit cb7386d37e
1 changed files with 4 additions and 2 deletions
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drivers/net/ethernet/mellanox/mlx4/en_rx.c
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@ -535,9 +535,11 @@ void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
{
struct mlx4_en_dev *mdev = priv->mdev;
struct mlx4_en_rx_ring *ring = *pring;
struct bpf_prog *old_prog;
if (ring->xdp_prog)
bpf_prog_put(ring->xdp_prog);
old_prog = READ_ONCE(ring->xdp_prog);
if (old_prog)
bpf_prog_put(old_prog);
mlx4_free_hwq_res(mdev->dev, &ring->wqres, size * stride + TXBB_SIZE);
vfree(ring->rx_info);
ring->rx_info = NULL;