This is a note to let you know that I've just added the patch titled
net: mvneta: fix DMA buffer unmapping in mvneta_rx()
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-mvneta-fix-dma-buffer-unmapping-in-mvneta_rx.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Sep 30 05:25:07 CEST 2015
From: Simon Guinot <simon.guinot@xxxxxxxxxxxx>
Date: Tue, 15 Sep 2015 22:41:21 +0200
Subject: net: mvneta: fix DMA buffer unmapping in mvneta_rx()
From: Simon Guinot <simon.guinot@xxxxxxxxxxxx>
[ Upstream commit daf158d0d544cec80b7b30deff8cfc59a6e17610 ]
This patch fixes a regression introduced by the commit a84e32894191
("net: mvneta: fix refilling for Rx DMA buffers"). Due to this commit
the newly allocated Rx buffers are DMA-unmapped in place of those passed
to the networking stack. Obviously, this causes data corruptions.
This patch fixes the issue by ensuring that the right Rx buffers are
DMA-unmapped.
Reported-by: Oren Laskin <oren@xxxxxxxxxx>
Signed-off-by: Simon Guinot <simon.guinot@xxxxxxxxxxxx>
Fixes: a84e32894191 ("net: mvneta: fix refilling for Rx DMA buffers")
Cc: <stable@xxxxxxxxxxxxxxx> # v3.8+
Tested-by: Oren Laskin <oren@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/marvell/mvneta.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1479,6 +1479,7 @@ static int mvneta_rx(struct mvneta_port
struct mvneta_rx_desc *rx_desc = mvneta_rxq_next_desc_get(rxq);
struct sk_buff *skb;
unsigned char *data;
+ dma_addr_t phys_addr;
u32 rx_status;
int rx_bytes, err;
@@ -1486,6 +1487,7 @@ static int mvneta_rx(struct mvneta_port
rx_status = rx_desc->status;
rx_bytes = rx_desc->data_size - (ETH_FCS_LEN + MVNETA_MH_SIZE);
data = (unsigned char *)rx_desc->buf_cookie;
+ phys_addr = rx_desc->buf_phys_addr;
if (!mvneta_rxq_desc_is_first_last(rx_status) ||
(rx_status & MVNETA_RXD_ERR_SUMMARY)) {
@@ -1534,7 +1536,7 @@ static int mvneta_rx(struct mvneta_port
if (!skb)
goto err_drop_frame;
- dma_unmap_single(dev->dev.parent, rx_desc->buf_phys_addr,
+ dma_unmap_single(dev->dev.parent, phys_addr,
MVNETA_RX_BUF_SIZE(pp->pkt_size), DMA_FROM_DEVICE);
rcvd_pkts++;
Patches currently in stable-queue which might be from simon.guinot@xxxxxxxxxxxx are
queue-4.2/net-mvneta-fix-dma-buffer-unmapping-in-mvneta_rx.patch
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