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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>
This commit is contained in:
Jiang Liu 2012-12-07 13:43:50 -07:00 committed by Alex Williamson
parent 9df7b25ab7
commit de2b3eeafb
1 changed files with 2 additions and 1 deletions
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3
drivers/vfio/vfio.c
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@ -465,8 +465,9 @@ static int vfio_dev_viable(struct device *dev, void *data)
{
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);