Commit e2dcdfe95c0bd67e37db6057edd9c4ee1f1c7b17
1 parent
ec6931b281
Exists in
ti-lsk-linux-4.1.y
and in
10 other branches
virtio: virtio_break_device() to mark all virtqueues broken.
Good for post-apocalyptic scenarios, like S/390 hotplug. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Showing 2 changed files with 17 additions and 0 deletions Side-by-side Diff
drivers/virtio/virtio_ring.c
| ... | ... | @@ -865,5 +865,20 @@ |
| 865 | 865 | } |
| 866 | 866 | EXPORT_SYMBOL_GPL(virtqueue_is_broken); |
| 867 | 867 | |
| 868 | +/* | |
| 869 | + * This should prevent the device from being used, allowing drivers to | |
| 870 | + * recover. You may need to grab appropriate locks to flush. | |
| 871 | + */ | |
| 872 | +void virtio_break_device(struct virtio_device *dev) | |
| 873 | +{ | |
| 874 | + struct virtqueue *_vq; | |
| 875 | + | |
| 876 | + list_for_each_entry(_vq, &dev->vqs, list) { | |
| 877 | + struct vring_virtqueue *vq = to_vvq(_vq); | |
| 878 | + vq->broken = true; | |
| 879 | + } | |
| 880 | +} | |
| 881 | +EXPORT_SYMBOL_GPL(virtio_break_device); | |
| 882 | + | |
| 868 | 883 | MODULE_LICENSE("GPL"); |
include/linux/virtio.h
| ... | ... | @@ -106,6 +106,8 @@ |
| 106 | 106 | int register_virtio_device(struct virtio_device *dev); |
| 107 | 107 | void unregister_virtio_device(struct virtio_device *dev); |
| 108 | 108 | |
| 109 | +void virtio_break_device(struct virtio_device *dev); | |
| 110 | + | |
| 109 | 111 | /** |
| 110 | 112 | * virtio_driver - operations for a virtio I/O driver |
| 111 | 113 | * @driver: underlying device driver (populate name and owner). |