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From: Sasha Levin <>
Cc: Robin Murphy <>,
	John David Anglin <>,
	Thomas Petazzoni <>,
	Vinod Koul <>, Sasha Levin <>,
Subject: [PATCH AUTOSEL 4.19 194/671] dmaengine: mv_xor: Use correct device for DMA API
Date: Thu, 16 Jan 2020 11:51:43 -0500
Message-ID: <> (raw)
In-Reply-To: <>

From: Robin Murphy <>

[ Upstream commit 3e5daee5ecf314da33a890fabaa2404244cd2a36 ]

Using dma_dev->dev for mappings before it's assigned with the correct
device is unlikely to work as expected, and with future dma-direct
changes, passing a NULL device may end up crashing entirely. I don't
know enough about this hardware or the mv_xor_prep_dma_interrupt()
operation to implement the appropriate error-handling logic that would
have revealed those dma_map_single() calls failing on arm64 for as long
as the driver has been enabled there, but moving the assignment earlier
will at least make the current code operate as intended.

Fixes: 22843545b200 ("dma: mv_xor: Add support for DMA_INTERRUPT")
Reported-by: John David Anglin <>
Tested-by: John David Anglin <>
Signed-off-by: Robin Murphy <>
Acked-by: Thomas Petazzoni <>
Tested-by: Thomas Petazzoni <>
Signed-off-by: Vinod Koul <>
Signed-off-by: Sasha Levin <>
 drivers/dma/mv_xor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 969534c1a6c6..abc8d3e0487b 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -1059,6 +1059,7 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
 		mv_chan->op_in_desc = XOR_MODE_IN_DESC;
 	dma_dev = &mv_chan->dmadev;
+	dma_dev->dev = &pdev->dev;
 	mv_chan->xordev = xordev;
@@ -1091,7 +1092,6 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
 	dma_dev->device_free_chan_resources = mv_xor_free_chan_resources;
 	dma_dev->device_tx_status = mv_xor_status;
 	dma_dev->device_issue_pending = mv_xor_issue_pending;
-	dma_dev->dev = &pdev->dev;
 	/* set prep routines based on capability */
 	if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))

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