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SubjectRe: [RFC PATCH v5 6/6] i2c: dev: mark RDWR buffers as DMA_SAFE
On Wed, 20 Sep 2017 20:59:56 +0200
Wolfram Sang <wsa+renesas@sang-engineering.com> wrote:

> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Makes sense as do the other drivers.

Feel free to add

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

to all of them (though they hardly took a lot of reviewing given how simple
the patches were :)

> ---
> 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

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