From: Jiang Liu <jiang.liu@xxxxxxxxxx>
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@xxxxxxxxxx>
---
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 18714b9..f158e42 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -520,8 +520,9 @@ static bool vfio_whitelisted_driver(struct device_driver *drv)
static int vfio_dev_viable(struct device *dev, void *data)
{
struct vfio_device_driver *driver;
+ struct device_driver *drv = ACCESS_ONCE(dev->driver);
- if (!dev->driver || vfio_whitelisted_driver(dev->driver))
+ if (!drv || vfio_whitelisted_driver(drv))
return 0;
mutex_lock(&vfio.device_drivers_lock);
--
1.7.9.5
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