[PATCH 2/8] virtio: pci: Fix legacy private data lookup when deleting queues

[Bin Meng <bin.meng@processmission.com>]

The virtqueue's vdev points to the functional device, while the PCI I/O
register mapping belongs to its parent transport. The current lookup
therefore treats the functional driver's private data as transport data
and uses a queue pointer as the register base.

Queue deletion can overwrite the queue's list links and crash when
unlinking it. Fetch the parent transport's private data instead.

Fixes: 4135e10732a0 ("virtio: Add virtio over pci transport driver")
Signed-off-by: Bin Meng <bin.meng@processmission.com>
---

 drivers/virtio/virtio_pci_legacy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index 15f8c6e7d25..369c15bd88c 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -226,7 +226,7 @@ error_available:
 
 static void virtio_pci_del_vq(struct virtqueue *vq)
 {
-	struct virtio_pci_priv *priv = dev_get_priv(vq->vdev);
+	struct virtio_pci_priv *priv = dev_get_priv(vq->vdev->parent);
 	unsigned int index = vq->index;
 
 	iowrite16(index, priv->ioaddr + VIRTIO_PCI_QUEUE_SEL);
-- 
2.53.0