linux-kernel - [PATCH 6/7] mtd: spi-nor: ensure memory used for nor->read() is DMA safe

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: <20181108110653.21063-7-tudor.ambarus@microchip.com>
Date:   Thu, 8 Nov 2018 11:07:18 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <boris.brezillon@...tlin.com>, <marek.vasut@...il.com>,
        <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <richard@....at>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <yogeshnarayan.gaur@....com>, <cyrille.pitchen@...ev4u.fr>,
        <Tudor.Ambarus@...rochip.com>
Subject: [PATCH 6/7] mtd: spi-nor: ensure memory used for nor->read() is DMA
 safe

Use GFP_DMA to ensure that the memory we allocate for transfers in
nor->read() can be DMAed.

spi_nor_read_sfdp() calls spi_nor_read_raw(), which calls nor-read().
The latter might be implemented by the m25p80 driver which is on top
of the spi-mem layer. spi-mem requires DMA-able in/out buffers, let's
make sure they are.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 2eaa21c85483..a13fc82bade5 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2238,7 +2238,7 @@ static int spi_nor_read_sfdp_dma_unsafe(struct spi_nor *nor, u32 addr,
 	void *dma_safe_buf;
 	int ret;
 
-	dma_safe_buf = kmalloc(len, GFP_KERNEL);
+	dma_safe_buf = kmalloc(len, GFP_KERNEL | GFP_DMA);
 	if (!dma_safe_buf)
 		return -ENOMEM;
 
@@ -3053,7 +3053,7 @@ static int spi_nor_parse_smpt(struct spi_nor *nor,
 
 	/* Read the Sector Map Parameter Table. */
 	len = smpt_header->length * sizeof(*smpt);
-	smpt = kzalloc(len, GFP_KERNEL);
+	smpt = kzalloc(len, GFP_KERNEL | GFP_DMA);
 	if (!smpt)
 		return -ENOMEM;
 
@@ -3140,7 +3140,7 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
 	if (header.nph) {
 		psize = header.nph * sizeof(*param_headers);
 
-		param_headers = kmalloc(psize, GFP_KERNEL);
+		param_headers = kmalloc(psize, GFP_KERNEL | GFP_DMA);
 		if (!param_headers)
 			return -ENOMEM;
 
-- 
2.9.4