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Commit e2dcdfe9 authored by Rusty Russell's avatar Rusty Russell
Browse files

virtio: virtio_break_device() to mark all virtqueues broken. 



Good for post-apocalyptic scenarios, like S/390 hotplug.

Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent ec6931b2

drivers/virtio/virtio_ring.c

+15 −0
Original line number Diff line number Diff line
@@ -865,4 +865,19 @@ bool virtqueue_is_broken(struct virtqueue *_vq) 
}

EXPORT_SYMBOL_GPL(virtqueue_is_broken);



/*

 * This should prevent the device from being used, allowing drivers to

 * recover.  You may need to grab appropriate locks to flush.

 */

void virtio_break_device(struct virtio_device *dev)

{

	struct virtqueue *_vq;



	list_for_each_entry(_vq, &dev->vqs, list) {

		struct vring_virtqueue *vq = to_vvq(_vq);

		vq->broken = true;

	}

}

EXPORT_SYMBOL_GPL(virtio_break_device);



MODULE_LICENSE("GPL");

include/linux/virtio.h

+2 −0
Original line number Diff line number Diff line
@@ -106,6 +106,8 @@ static inline struct virtio_device *dev_to_virtio(struct device *_dev) 
int register_virtio_device(struct virtio_device *dev);

void unregister_virtio_device(struct virtio_device *dev);



void virtio_break_device(struct virtio_device *dev);



/**

 * virtio_driver - operations for a virtio I/O driver

 * @driver: underlying device driver (populate name and owner).