linux-kernel - [PATCH v2] mtd: spi-nor: cadence-quadspi: Use proper enum for dma_unmap

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

Message-Id: <20180925073202.23945-1-natechancellor@gmail.com>
Date:   Tue, 25 Sep 2018 00:32:03 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Marek Vasut <marek.vasut@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Richard Weinberger <richard@....at>, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH v2] mtd: spi-nor: cadence-quadspi: Use proper enum for dma_unmap_single

Clang warns when one enumerated type is converted implicitly to another.

drivers/mtd/spi-nor/cadence-quadspi.c:962:47: warning: implicit
conversion from enumeration type 'enum dma_transfer_direction' to
different enumeration type 'enum dma_data_direction' [-Wenum-conversion]
        dma_dst = dma_map_single(nor->dev, buf, len, DMA_DEV_TO_MEM);
                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
./include/linux/dma-mapping.h:428:66: note: expanded from macro
'dma_map_single'
#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
                                   ~~~~~~~~~~~~~~~~~~~~          ^
drivers/mtd/spi-nor/cadence-quadspi.c:997:43: warning: implicit
conversion from enumeration type 'enum dma_transfer_direction' to
different enumeration type 'enum dma_data_direction' [-Wenum-conversion]
        dma_unmap_single(nor->dev, dma_dst, len, DMA_DEV_TO_MEM);
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
./include/linux/dma-mapping.h:429:70: note: expanded from macro
'dma_unmap_single'
#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
                                     ~~~~~~~~~~~~~~~~~~~~~~          ^
2 warnings generated.

Use the proper enums from dma_data_direction to satisfy Clang.

DMA_FROM_DEVICE = DMA_DEV_TO_MEM = 2

Link: https://github.com/ClangBuiltLinux/linux/issues/108
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

v1 -> v2:

* Fix second half of patch (previously incorrectly used DMA_TO_DEVICE),
  thanks to Tudor Ambarus for catching this.

 drivers/mtd/spi-nor/cadence-quadspi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
index 8e714fbfa521..e24db817154e 100644
--- a/drivers/mtd/spi-nor/cadence-quadspi.c
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -959,7 +959,7 @@ static int cqspi_direct_read_execute(struct spi_nor *nor, u_char *buf,
 		return 0;
 	}
 
-	dma_dst = dma_map_single(nor->dev, buf, len, DMA_DEV_TO_MEM);
+	dma_dst = dma_map_single(nor->dev, buf, len, DMA_FROM_DEVICE);
 	if (dma_mapping_error(nor->dev, dma_dst)) {
 		dev_err(nor->dev, "dma mapping failed\n");
 		return -ENOMEM;
@@ -994,7 +994,7 @@ static int cqspi_direct_read_execute(struct spi_nor *nor, u_char *buf,
 	}
 
 err_unmap:
-	dma_unmap_single(nor->dev, dma_dst, len, DMA_DEV_TO_MEM);
+	dma_unmap_single(nor->dev, dma_dst, len, DMA_FROM_DEVICE);
 
 	return 0;
 }
-- 
2.19.0