[Patch 1/1] vfio: Move "device->open_count--" out of group_rwsem in vfio_device_open()

[Yi Liu <yi.l.liu@xxxxxxxxx>]

No need to protect open_count with group_rwsem

Fixes: 421cfe6596f6 ("vfio: remove VFIO_GROUP_NOTIFY_SET_KVM")

cc: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
 drivers/vfio/vfio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 61e71c1154be..44c3bf8023ac 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1146,10 +1146,10 @@ static struct file *vfio_device_open(struct vfio_device *device)
 	if (device->open_count == 1 && device->ops->close_device)
 		device->ops->close_device(device);
 err_undo_count:
+	up_read(&device->group->group_rwsem);
 	device->open_count--;
 	if (device->open_count == 0 && device->kvm)
 		device->kvm = NULL;
-	up_read(&device->group->group_rwsem);
 	mutex_unlock(&device->dev_set->lock);
 	module_put(device->dev->driver->owner);
 err_unassign_container:
-- 
2.27.0