pci: Make errp the last parameter of pci_add_capability()

Add Error argument for pci_add_capability() to leverage the errp
to pass info on errors. This way is helpful for its callers to
make a better error handling when moving to 'realize'.

Cc: pbonzini@redhat.com
Cc: rth@twiddle.net
Cc: ehabkost@redhat.com
Cc: mst@redhat.com
Cc: jasowang@redhat.com
Cc: marcel@redhat.com
Cc: alex.williamson@redhat.com
Cc: armbru@redhat.com
Signed-off-by: Mao Zhongyi <maozy.fnst@cn.fujitsu.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 5881968..70bfb59 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -1743,11 +1743,14 @@ static int vfio_setup_pcie_cap(VFIOPCIDevice *vdev, int pos, uint8_t size,
                                PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS);
     }
 
-    pos = pci_add_capability(&vdev->pdev, PCI_CAP_ID_EXP, pos, size);
-    if (pos > 0) {
-        vdev->pdev.exp.exp_cap = pos;
+    pos = pci_add_capability(&vdev->pdev, PCI_CAP_ID_EXP, pos, size,
+                             errp);
+    if (pos < 0) {
+        return pos;
     }
 
+    vdev->pdev.exp.exp_cap = pos;
+
     return pos;
 }