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 <[email protected]> --- drivers/vfio/vfio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 3359ec2..0090212 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -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); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
