linux-kernel - [PATCH 4.18 224/235] staging: fsl-dpaa2/eth: Fix DMA mapping direction

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Message-Id: <20180924113125.577011821@linuxfoundation.org>
Date:   Mon, 24 Sep 2018 13:53:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ioana Radulescu <ruxandra.radulescu@....com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 224/235] staging: fsl-dpaa2/eth: Fix DMA mapping direction

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ioana Radulescu <ruxandra.radulescu@....com>

[ Upstream commit 466bcdc1fa303be175c45d054bb00effc575033a ]

We are using DMA_FROM_DEVICE when mapping RX frame buffers,
but DMA_BIDIRECTIONAL for unmap. Fix the direction for DMA
unmapping operation.

Fixes: 87eb55e418b7 ("staging: fsl-dpaa2/eth: Fix potential endless loop")

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
@@ -767,7 +767,7 @@ static void free_bufs(struct dpaa2_eth_p
 	for (i = 0; i < count; i++) {
 		vaddr = dpaa2_iova_to_virt(priv->iommu_domain, buf_array[i]);
 		dma_unmap_single(dev, buf_array[i], DPAA2_ETH_RX_BUF_SIZE,
-				 DMA_BIDIRECTIONAL);
+				 DMA_FROM_DEVICE);
 		skb_free_frag(vaddr);
 	}
 }