diff options
| author | Amir Vadai <amirv@mellanox.com> | 2013-10-07 13:38:13 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-08 16:09:50 -0400 |
| commit | 021f1107ffdae7a82af6c53f4c52654062e365c6 (patch) | |
| tree | ac5bd06eed05aec7bba4c49ba55aaaf32a8e39e9 /drivers | |
| parent | 70fbe0794393829d9acd686428d87c27b6f6984b (diff) | |
| download | linux-021f1107ffdae7a82af6c53f4c52654062e365c6.tar.gz | |
net/mlx4_en: Fix pages never dma unmapped on rx
This patch fixes a bug introduced by commit 51151a16 (mlx4: allow order-0 memory allocations in RX path). dma_unmap_page never reached because condition to detect last fragment in page is wrong. offset+frag_stride can't be greater than size, need to make sure no additional frag will fit in page => compare offset + frag_stride + next_frag_size instead. next_frag_size is the same as the current one, since page is shared only with frags of the same size. CC: Eric Dumazet <edumazet@google.com> Signed-off-by: Amir Vadai <amirv@mellanox.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/en_rx.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c index 066fc2747854..afe2efa69c86 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c @@ -135,9 +135,10 @@ static void mlx4_en_free_frag(struct mlx4_en_priv *priv, int i) { const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i]; + u32 next_frag_end = frags[i].page_offset + 2 * frag_info->frag_stride; - if (frags[i].page_offset + frag_info->frag_stride > - frags[i].page_size) + + if (next_frag_end > frags[i].page_size) dma_unmap_page(priv->ddev, frags[i].dma, frags[i].page_size, PCI_DMA_FROMDEVICE); |