linux-kernel - [RFC PATCH v4 6/6] i2c: dev: mark RDWR buffers as DMA

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Message-Id: <20170817141449.23958-7-wsa+renesas@sang-engineering.com>
Date:   Thu, 17 Aug 2017 16:14:49 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-i2c@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-input@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: [RFC PATCH v4 6/6] i2c: dev: mark RDWR buffers as DMA_SAFE

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 drivers/i2c/i2c-dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 6f638bbc922db4..bbc7aadb4c899d 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -280,6 +280,8 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
 			res = PTR_ERR(rdwr_pa[i].buf);
 			break;
 		}
+		/* memdup_user allocates with GFP_KERNEL, so DMA is ok */
+		rdwr_pa[i].flags |= I2C_M_DMA_SAFE;
 
 		/*
 		 * If the message length is received from the slave (similar
-- 
2.11.0