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net: mvpp2: allocate zeroed tx descriptors 

Reserved and unused fields in the Tx descriptors should be 0. The PPv2
driver doesn't clear them at run-time (for performance reasons) but
these descriptors aren't zeroed when allocated, which can lead to
unpredictable behaviors. This patch fixes this by using
dma_zalloc_coherent instead of dma_alloc_coherent.

Fixes: 3f518509de ("ethernet: Add new driver for Marvell Armada 375 network unit")
Signed-off-by: Yan Markman <ymarkman@marvell.com>
[Antoine: commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yan Markman 2017-11-30 10:49:46 +01:00 committed by David S. Miller
parent b915176102
commit a154f8e399
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/marvell/mvpp2.c
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@ -5598,7 +5598,7 @@ static int mvpp2_aggr_txq_init(struct platform_device *pdev,
u32 txq_dma;
/* Allocate memory for TX descriptors */
aggr_txq->descs = dma_alloc_coherent(&pdev->dev,
aggr_txq->descs = dma_zalloc_coherent(&pdev->dev,
MVPP2_AGGR_TXQ_SIZE * MVPP2_DESC_ALIGNED_SIZE,
&aggr_txq->descs_dma, GFP_KERNEL);
if (!aggr_txq->descs)