Re: [RFC PATCH v5 6/6] i2c: dev: mark RDWR buffers as DMA_SAFE
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Date: 2017-09-21 14:18:07
Also in:
dri-devel, linux-i2c, linux-iio, linux-media, linux-renesas-soc, lkml
On Wed, 20 Sep 2017 20:59:56 +0200 Wolfram Sang [off-list ref] 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 :)
quoted hunk ↗ jump to hunk
--- 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