linux-kernel - [PATCH AUTOSEL 5.1 15/59] fpga: dfl: afu: Pass the correct device to dma_mapping

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Date:   Fri, 14 Jun 2019 16:27:59 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Scott Wood <swood@...hat.com>, Wu Hao <hao.wu@...el.com>,
        Moritz Fischer <mdf@...nel.org>, Alan Tull <atull@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-fpga@...r.kernel.org
Subject: [PATCH AUTOSEL 5.1 15/59] fpga: dfl: afu: Pass the correct device to dma_mapping_error()

From: Scott Wood <swood@...hat.com>

[ Upstream commit 13069847a475b60069918dc9971f5adb42811ce3 ]

dma_mapping_error() was being called on a different device struct than
what was passed to map/unmap.  Besides rendering the error checking
ineffective, it caused a debug splat with CONFIG_DMA_API_DEBUG.

Signed-off-by: Scott Wood <swood@...hat.com>
Acked-by: Wu Hao <hao.wu@...el.com>
Acked-by: Moritz Fischer <mdf@...nel.org>
Acked-by: Alan Tull <atull@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/fpga/dfl-afu-dma-region.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fpga/dfl-afu-dma-region.c b/drivers/fpga/dfl-afu-dma-region.c
index e18a786fc943..cd68002ac097 100644
--- a/drivers/fpga/dfl-afu-dma-region.c
+++ b/drivers/fpga/dfl-afu-dma-region.c
@@ -399,7 +399,7 @@ int afu_dma_map_region(struct dfl_feature_platform_data *pdata,
 				    region->pages[0], 0,
 				    region->length,
 				    DMA_BIDIRECTIONAL);
-	if (dma_mapping_error(&pdata->dev->dev, region->iova)) {
+	if (dma_mapping_error(dfl_fpga_pdata_to_parent(pdata), region->iova)) {
 		dev_err(&pdata->dev->dev, "failed to map for dma\n");
 		ret = -EFAULT;
 		goto unpin_pages;
-- 
2.20.1