linux-kernel - [PATCH 1/3] dma: mv_xor: do not sync the DMA buffer after being deallocated

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Date:	Fri, 18 Jan 2013 08:46:20 +0100
From:	Lubomir Rintel <lkundrak@...sk>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Dan Williams <djbw@...com>, Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH 1/3] dma: mv_xor: do not sync the DMA buffer after being deallocated

DMA_CHECK was unhappy:
mv_xor mv_xor.0: DMA-API: device driver tries to sync DMA memory it has not allocated [device address=0x000000001f3a1a40] [size=2000 bytes]

Deallocation, which involves a sync, happens automatically by
mv_xor_slot_cleanup() once the transfer is finished.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 drivers/dma/mv_xor.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index e666983..8b81a04 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -960,8 +960,6 @@ static int mv_xor_memcpy_self_test(struct mv_xor_chan *mv_chan)
 		goto free_resources;
 	}
 
-	dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma,
-				MV_XOR_TEST_SIZE, DMA_FROM_DEVICE);
 	if (memcmp(src, dest, MV_XOR_TEST_SIZE)) {
 		dev_err(dma_chan->device->dev,
 			"Self-test copy failed compare, disabling\n");
@@ -1054,8 +1052,6 @@ mv_xor_xor_self_test(struct mv_xor_chan *mv_chan)
 		goto free_resources;
 	}
 
-	dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma,
-				PAGE_SIZE, DMA_FROM_DEVICE);
 	for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
 		u32 *ptr = page_address(dest);
 		if (ptr[i] != cmp_word) {
-- 
1.7.1

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