linux-kernel - [PATCH AUTOSEL for 4.14 023/100] net: mvpp2: allocate zeroed tx descriptors

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Message-ID: <20180128222547.7398-23-alexander.levin@microsoft.com>
Date:   Sun, 28 Jan 2018 22:26:12 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Yan Markman <ymarkman@...vell.com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 023/100] net: mvpp2: allocate zeroed tx
 descriptors

From: Yan Markman <ymarkman@...vell.com>

[ Upstream commit a154f8e399a063137fc42b961f437248d55ece29 ]

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: 3f518509dedc ("ethernet: Add new driver for Marvell Armada 375 network unit")
Signed-off-by: Yan Markman <ymarkman@...vell.com>
[Antoine: commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
Signed-off-by: David S. Miller <davem@...emloft.net>

Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/ethernet/marvell/mvpp2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index fcf9ba5eb8d1..e9bc551d7621 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -5408,7 +5408,7 @@ 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)
-- 
2.11.0