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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2017-02-21 11:28:01 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-15 09:57:13 +0800
commitb57ffb2a8466a7628b316c8e3a5ce34b8ee4e519 (patch)
treef7d5b7035465723ac3ecb10729d79c0c3395d63c /drivers/net
parent376a12eb7f608fad96b13fab3f151eb4c9b40c7c (diff)
downloadlinux-linaro-stable-b57ffb2a8466a7628b316c8e3a5ce34b8ee4e519.tar.gz
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/net')
-rw-r--r--drivers/net/ethernet/marvell/mvpp2.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index 25aba9886990..0e67145bc418 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -993,7 +993,7 @@ 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;