linux-kernel - [PATCH] dmaengine: ste_dma40: fix implicit conversion

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1426981868-1988-1-git-send-email-stefan@agner.ch>
Date:	Sun, 22 Mar 2015 00:51:08 +0100
From:	Stefan Agner <stefan@...er.ch>
To:	linus.walleij@...aro.org, vinod.koul@...el.com
Cc:	dan.j.williams@...el.com, dmaengine@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	llvmlinux@...ts.linuxfoundation.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH] dmaengine: ste_dma40: fix implicit conversion

The function d40_prep_sg takes the type enum dma_transfer_direction
as second last parameter. However, the memcpy calls pass DMA_NONE
which is of type enum dma_data_direction. Fix this by passing the
actual transfer direction DMA_MEM_TO_MEM.

This does not change the actual code flow since only the transfer
direction DMA_MEM_TO_DEV and DMA_DEV_TO_MEM are actually used in the
function d40_prep_sg.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
This was uncovered by a LLVM/clang warnings:
drivers/dma/ste_dma40.c:2505:48: warning: implicit conversion from enumeration type 'enum dma_data_direction' to different enumeration type 'enum dma_transfer_direction'
      [-Wenum-conversion]
        return d40_prep_sg(chan, &src_sg, &dst_sg, 1, DMA_NONE, dma_flags);
               ~~~~~~~~~~~                            ^~~~~~~~
drivers/dma/ste_dma40.c:2517:54: warning: implicit conversion from enumeration type 'enum dma_data_direction' to different enumeration type 'enum dma_transfer_direction'
      [-Wenum-conversion]
        return d40_prep_sg(chan, src_sg, dst_sg, src_nents, DMA_NONE, dma_flags);
               ~~~~~~~~~~~                                  ^~~~~~~~

 drivers/dma/ste_dma40.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 15d4946..ace03dc 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -2502,7 +2502,8 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
 	sg_dma_len(&dst_sg) = size;
 	sg_dma_len(&src_sg) = size;
 
-	return d40_prep_sg(chan, &src_sg, &dst_sg, 1, DMA_NONE, dma_flags);
+	return d40_prep_sg(chan, &src_sg, &dst_sg, 1,
+			   DMA_MEM_TO_MEM, dma_flags);
 }
 
 static struct dma_async_tx_descriptor *
@@ -2514,7 +2515,8 @@ d40_prep_memcpy_sg(struct dma_chan *chan,
 	if (dst_nents != src_nents)
 		return NULL;
 
-	return d40_prep_sg(chan, src_sg, dst_sg, src_nents, DMA_NONE, dma_flags);
+	return d40_prep_sg(chan, src_sg, dst_sg, src_nents,
+			   DMA_MEM_TO_MEM, dma_flags);
 }
 
 static struct dma_async_tx_descriptor *
-- 
2.3.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/