i2c: dev: mark RDWR buffers as DMA_SAFE

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 2cab27a..036a03f 100644 (file)
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -264,6 +264,8 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
                        res = PTR_ERR(msgs[i].buf);
                        break;
                }
+               /* memdup_user allocates with GFP_KERNEL, so DMA is ok */
+               msgs[i].flags |= I2C_M_DMA_SAFE;
 
                /*
                 * If the message length is received from the slave (similar