linux-kernel - [PATCH 01/20] async_tx: add missing DMA unmap to async

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Message-id: <1352109631-3385-2-git-send-email-b.zolnierkie@samsung.com>
Date:	Mon, 05 Nov 2012 11:00:12 +0100
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	djbw@...com, dwmw2@...radead.org, hskinnemoen@...il.com,
	iws@...o.caltech.edu, vinod.koul@...el.com, vipin.kumar@...com,
	t.figa@...sung.com, kyungmin.park@...sung.com,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [PATCH 01/20] async_tx: add missing DMA unmap to async_memcpy()

Do DMA unmap on ->device_prep_dma_memcpy failure.

Cc: Dan Williams <djbw@...com>
Cc: Tomasz Figa <t.figa@...sung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 crypto/async_tx/async_memcpy.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
index 361b5e8..9e62fef 100644
--- a/crypto/async_tx/async_memcpy.c
+++ b/crypto/async_tx/async_memcpy.c
@@ -67,6 +67,12 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
 
 		tx = device->device_prep_dma_memcpy(chan, dma_dest, dma_src,
 						    len, dma_prep_flags);
+		if (!tx) {
+			dma_unmap_page(device->dev, dma_dest, len,
+				       DMA_FROM_DEVICE);
+			dma_unmap_page(device->dev, dma_src, len,
+				       DMA_TO_DEVICE);
+		}
 	}
 
 	if (tx) {
-- 
1.8.0

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