hw/pci: Assert a bar is not registered multiple times

Nothing should be doing this, but it doesn't get caught by
pci_register_bar(). Add an assertion to prevent misuse.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20250117172842.406338-3-npiggin@gmail.com>
Reviewed-by: Phil Dennis-Jordan <phil@philjordan.eu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Phil Dennis-Jordan <phil@philjordan.eu>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 69a1b8c298fc489eab97fed97909ffbe07136bc3..1d42847ef04457e49af535b646c0beb0c543dedf 100644 (file)
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1398,6 +1398,7 @@ void pci_register_bar(PCIDevice *pci_dev, int region_num,
     assert(hdr_type != PCI_HEADER_TYPE_BRIDGE || region_num < 2);
 
     r = &pci_dev->io_regions[region_num];
+    assert(!r->size);
     r->addr = PCI_BAR_UNMAPPED;
     r->size = size;
     r->type = type;