diff options
| author | Michal Schmidt <mschmidt@redhat.com> | 2015-06-26 18:50:00 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-06-29 06:25:01 +0300 |
| commit | 8031612d7fa8e49589a91da238a93a067826c668 (patch) | |
| tree | 9f6e8e33b79fed5adc75395a49faa33949fdbe31 /drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | |
| parent | 0f8b6cea1f3271ccc37dd2847b39e235461e0ced (diff) | |
| download | linux-8031612d7fa8e49589a91da238a93a067826c668.tar.xz | |
bnx2x: fix DMA API usage
With CONFIG_DMA_API_DEBUG=y bnx2x triggers the error "DMA-API: device
driver frees DMA memory with wrong function".
On archs where PAGE_SIZE > SGE_PAGE_SIZE it also triggers "DMA-API:
device driver frees DMA memory with different size".
Fix this by making the mapping and unmapping symmetric:
- Do not map the whole pool page at once. Instead map the
SGE_PAGE_SIZE-sized pieces individually, so they can be unmapped in
the same manner.
- What's mapped using dma_map_page() must be unmapped using
dma_unmap_page().
Tested on ppc64.
Fixes: 4cace675d687 ("bnx2x: Alloc 4k fragment for each rx ring buffer element")
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c')
| -rw-r--r-- | drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c index 45e7c65f411f..a90d7364334f 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c @@ -563,23 +563,20 @@ static int bnx2x_alloc_rx_sge(struct bnx2x *bp, struct bnx2x_fastpath *fp, return -ENOMEM; } - pool->dma = dma_map_page(&bp->pdev->dev, pool->page, 0, - PAGE_SIZE, DMA_FROM_DEVICE); - if (unlikely(dma_mapping_error(&bp->pdev->dev, - pool->dma))) { - __free_pages(pool->page, PAGES_PER_SGE_SHIFT); - pool->page = NULL; - BNX2X_ERR("Can't map sge\n"); - return -ENOMEM; - } pool->offset = 0; } + mapping = dma_map_page(&bp->pdev->dev, pool->page, + pool->offset, SGE_PAGE_SIZE, DMA_FROM_DEVICE); + if (unlikely(dma_mapping_error(&bp->pdev->dev, mapping))) { + BNX2X_ERR("Can't map sge\n"); + return -ENOMEM; + } + get_page(pool->page); sw_buf->page = pool->page; sw_buf->offset = pool->offset; - mapping = pool->dma + sw_buf->offset; dma_unmap_addr_set(sw_buf, mapping, mapping); sge->addr_hi = cpu_to_le32(U64_HI(mapping)); @@ -648,9 +645,9 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct bnx2x_fastpath *fp, return err; } - dma_unmap_single(&bp->pdev->dev, - dma_unmap_addr(&old_rx_pg, mapping), - SGE_PAGE_SIZE, DMA_FROM_DEVICE); + dma_unmap_page(&bp->pdev->dev, + dma_unmap_addr(&old_rx_pg, mapping), + SGE_PAGE_SIZE, DMA_FROM_DEVICE); /* Add one frag and update the appropriate fields in the skb */ if (fp->mode == TPA_MODE_LRO) skb_fill_page_desc(skb, j, old_rx_pg.page, |