[PATCH 0/4] virtio: fix four bugs across mmio, pci, and vring

[Andrew Stellman <astellman@stellman-greene.com>]

Four independent fixes across the virtio subsystem:

1. virtio-mmio: vm_reset() returns without polling for the status
   register to read back as 0, violating the spec. Add a poll loop
   matching the existing pattern in virtio-pci's vp_reset().

2. virtio-pci: vp_find_vqs_intx() uses a sequential counter instead
   of avq->vq_index for the admin VQ, unlike the MSI-X path.

3. virtio-pci: vp_interrupt() returns IRQ_NONE for config-change-only
   interrupts because it unconditionally returns vp_vring_interrupt()'s
   result. Track the config-change handling and return IRQ_HANDLED.

4. virtio_ring: vring_transport_features() clears VIRTIO_F_RING_RESET
   during feature negotiation because it is missing from the whitelist.

Andrew Stellman (4):
  virtio-mmio: wait for status readback after reset
  virtio-pci: use avq->vq_index for admin VQ in INTx path
  virtio-pci: return IRQ_HANDLED for config-change interrupts
  virtio_ring: preserve VIRTIO_F_RING_RESET in transport features

 drivers/virtio/virtio_mmio.c       |  3 +++
 drivers/virtio/virtio_pci_common.c | 12 +++++++++---
 drivers/virtio/virtio_ring.c       |  2 ++
 3 files changed, 14 insertions(+), 3 deletions(-)

-- 
2.34.1