[v6,3/9] i2c: dev: mark RDWR buffers as DMA_SAFE

Message ID 20171104202009.3818-4-wsa+renesas@sang-engineering.com
State New
Headers show
Series
  • i2c: document DMA handling and add helpers for it
Related show

Commit Message

Wolfram Sang Nov. 4, 2017, 8:20 p.m.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/i2c/i2c-dev.c | 2 ++
 1 file changed, 2 insertions(+)

Patch

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