pcie: simplify pcie_add_capability()

When we add PCIe extended capabilities, we should be following the rule
that we add the head extended cap (at offset 0x100) first, then the rest
of them. Meanwhile, we are always adding new capability bits at the end
of the list. Here the "next" looks meaningless in all cases since it
should always be zero (along with the "header").

Simplify the function a bit, and it looks more readable now.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index f4dd177bc4a74a011e6668e2db6027ba91aba39a..fc54bfd53db6f045ebfad385d533b933ec0db5bf 100644 (file)
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -665,32 +665,24 @@ void pcie_add_capability(PCIDevice *dev,
                          uint16_t cap_id, uint8_t cap_ver,
                          uint16_t offset, uint16_t size)
 {
-    uint32_t header;
-    uint16_t next;
-
     assert(offset >= PCI_CONFIG_SPACE_SIZE);
     assert(offset < offset + size);
     assert(offset + size <= PCIE_CONFIG_SPACE_SIZE);
     assert(size >= 8);
     assert(pci_is_express(dev));
 
-    if (offset == PCI_CONFIG_SPACE_SIZE) {
-        header = pci_get_long(dev->config + offset);
-        next = PCI_EXT_CAP_NEXT(header);
-    } else {
+    if (offset != PCI_CONFIG_SPACE_SIZE) {
         uint16_t prev;
 
         /*
          * 0xffffffff is not a valid cap id (it's a 16 bit field). use
          * internally to find the last capability in the linked list.
          */
-        next = pcie_find_capability_list(dev, 0xffffffff, &prev);
-
+        pcie_find_capability_list(dev, 0xffffffff, &prev);
         assert(prev >= PCI_CONFIG_SPACE_SIZE);
-        assert(next == 0);
         pcie_ext_cap_set_next(dev, prev, offset);
     }
-    pci_set_long(dev->config + offset, PCI_EXT_CAP(cap_id, cap_ver, next));
+    pci_set_long(dev->config + offset, PCI_EXT_CAP(cap_id, cap_ver, 0));
 
     /* Make capability read-only by default */
     memset(dev->wmask + offset, 0, size);