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| author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2017-02-21 11:28:01 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-15 10:02:42 +0800 |
| commit | 60037aa689bac37816dca4eab2e8319eaa785dc6 (patch) | |
| tree | 58dc73aa1aeecd5e24f1f786877085aead79fe23 /drivers | |
| parent | e067f68db256c2dc04aae8acb42ebfc138d87a7e (diff) | |
| download | linux-stable-60037aa689bac37816dca4eab2e8319eaa785dc6.tar.gz linux-stable-60037aa689bac37816dca4eab2e8319eaa785dc6.tar.bz2 linux-stable-60037aa689bac37816dca4eab2e8319eaa785dc6.zip | |
net: mvpp2: fix DMA address calculation in mvpp2_txq_inc_put()
commit 239a3b663647869330955ec59caac0100ef9b60a upstream.
When TX descriptors are filled in, the buffer DMA address is split
between the tx_desc->buf_phys_addr field (high-order bits) and
tx_desc->packet_offset field (5 low-order bits).
However, when we re-calculate the DMA address from the TX descriptor in
mvpp2_txq_inc_put(), we do not take tx_desc->packet_offset into
account. This means that when the DMA address is not aligned on a 32
bytes boundary, we end up calling dma_unmap_single() with a DMA address
that was not the one returned by dma_map_single().
This inconsistency is detected by the kernel when DMA_API_DEBUG is
enabled. We fix this problem by properly calculating the DMA address in
mvpp2_txq_inc_put().
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/marvell/mvpp2.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c index 930c8165f2a8..0a4e81a253fb 100644 --- a/drivers/net/ethernet/marvell/mvpp2.c +++ b/drivers/net/ethernet/marvell/mvpp2.c @@ -991,7 +991,7 @@ static void mvpp2_txq_inc_put(struct mvpp2_txq_pcpu *txq_pcpu, txq_pcpu->buffs + txq_pcpu->txq_put_index; tx_buf->skb = skb; tx_buf->size = tx_desc->data_size; - tx_buf->phys = tx_desc->buf_phys_addr; + tx_buf->phys = tx_desc->buf_phys_addr + tx_desc->packet_offset; txq_pcpu->txq_put_index++; if (txq_pcpu->txq_put_index == txq_pcpu->size) txq_pcpu->txq_put_index = 0; |