VFIO: use ACCESS_ONCE() to guard access to dev->driver
Comments from dev_driver_string(),
/* dev->driver can change to NULL underneath us because of unbinding,
* so be careful about accessing it.
*/
So use ACCESS_ONCE() to guard access to dev->driver field.
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 3b7fa79..12c264d 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -465,8 +465,9 @@
{
struct vfio_group *group = data;
struct vfio_device *device;
+ struct device_driver *drv = ACCESS_ONCE(dev->driver);
- if (!dev->driver || vfio_whitelisted_driver(dev->driver))
+ if (!drv || vfio_whitelisted_driver(drv))
return 0;
device = vfio_group_get_device(group, dev);