s390/virtio: handle find on invalid queue gracefully (3438b2c0) · Commits · 戴 / test

A queue with a capacity of zero is clearly not a valid virtio queue. Some emulators report zero queue size if queried with an invalid queue index. Instead of crashing in this case let us just return -ENOENT. To make that work properly, let us fix the notifier cleanup logic as well. Cc: stable@vger.kernel.org Signed-off-by:

Halil Pasic <pasic@linux.ibm.com> Signed-off-by:

Cornelia Huck <cohuck@redhat.com> Signed-off-by:

Michael S. Tsirkin <mst@redhat.com>

drivers/s390/virtio/virtio_ccw.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -272,6 +272,8 @@ static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
		{
		struct virtio_ccw_vq_info *info;

		if (!vcdev->airq_info)
		return;
		list_for_each_entry(info, &vcdev->virtqueues, node)
		drop_airq_indicator(info->vq, vcdev->airq_info);
		}
		@@ -413,7 +415,7 @@ static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
		ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
		if (ret)
		return ret;
		return vcdev->config_block->num;
		return vcdev->config_block->num ?: -ENOENT;
		}

		static void virtio_ccw_del_vq(struct virtqueue vq, struct ccw1 ccw)

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