pci: prepare irq code for interrupt state

This rearranges code in preparation for interrupt state
implementation.
Changes:
	- split up bus walk away from interrupt handling
          into a subroutine
	- change irq_state from an array to bitmask
	- verify that irq_state values are 0 or 1 on load

There are no functional changes.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Isaku Yamahata <yamahata@valinux.co.jp>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/pci.h b/hw/pci.h
index 3e8abad222..ebf6c39d52 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -220,7 +220,7 @@ struct PCIDevice {
     qemu_irq *irq;
 
     /* Current IRQ levels.  Used internally by the generic PCI code.  */
-    int irq_state[PCI_NUM_PINS];
+    uint8_t irq_state;
 
     /* Capability bits */
     uint32_t cap_present;