diff options
author | Rusty Russell <rusty@rustcorp.com.au> | 2014-04-27 21:45:08 -0400 |
---|---|---|
committer | Rusty Russell <rusty@rustcorp.com.au> | 2014-04-27 22:04:13 -0400 |
commit | e2dcdfe95c0bd67e37db6057edd9c4ee1f1c7b17 (patch) | |
tree | d6e0676596a6f906362d836a08e4629dc9442fdd | |
parent | ec6931b281797b69e6cf109f9cc94d5a2bf994e0 (diff) |
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>
-rw-r--r-- | drivers/virtio/virtio_ring.c | 15 | ||||
-rw-r--r-- | include/linux/virtio.h | 2 |
2 files changed, 17 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 1e443629f76d..4d08f45a9c29 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c | |||
@@ -865,4 +865,19 @@ bool virtqueue_is_broken(struct virtqueue *_vq) | |||
865 | } | 865 | } |
866 | EXPORT_SYMBOL_GPL(virtqueue_is_broken); | 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 | MODULE_LICENSE("GPL"); | 883 | MODULE_LICENSE("GPL"); |
diff --git a/include/linux/virtio.h b/include/linux/virtio.h index e4abb84199be..b46671e28de2 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h | |||
@@ -106,6 +106,8 @@ static inline struct virtio_device *dev_to_virtio(struct device *_dev) | |||
106 | int register_virtio_device(struct virtio_device *dev); | 106 | int register_virtio_device(struct virtio_device *dev); |
107 | void unregister_virtio_device(struct virtio_device *dev); | 107 | void unregister_virtio_device(struct virtio_device *dev); |
108 | 108 | ||
109 | void virtio_break_device(struct virtio_device *dev); | ||
110 | |||
109 | /** | 111 | /** |
110 | * virtio_driver - operations for a virtio I/O driver | 112 | * virtio_driver - operations for a virtio I/O driver |
111 | * @driver: underlying device driver (populate name and owner). | 113 | * @driver: underlying device driver (populate name and owner). |