From b9471c6a4ad05bdd7d5a3e69da357fb5ced0d704 Mon Sep 17 00:00:00 2001
From: Michal Privoznik <mprivozn@redhat.com>
Date: Wed, 17 Sep 2014 11:33:35 +0200
Subject: [PATCH] qemu_capabilities: Change virQEMUCapsFillDomainCaps signature

Up till now the virQEMUCapsFillDomainCaps() was type of void as
there was no way for it to fail. This is, however, going to
change in the next commit.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
(cherry picked from commit 2b2e4a7acff5574dd82bfbd61a638270f6be54ef)
---
 src/qemu/qemu_capabilities.c | 25 ++++++++++++++++---------
 src/qemu/qemu_capabilities.h |  4 ++--
 src/qemu/qemu_driver.c       |  3 ++-
 tests/domaincapstest.c       | 19 ++++++++++++-------
 4 files changed, 32 insertions(+), 19 deletions(-)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index c999ee4..d2e5f47 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -3608,7 +3608,7 @@ virQEMUCapsGetDefaultMachine(virQEMUCapsPtr qemuCaps)
 }
 
 
-static void
+static int
 virQEMUCapsFillDomainLoaderCaps(virQEMUCapsPtr qemuCaps,
                                 virDomainCapsLoaderPtr loader,
                                 virArch arch)
@@ -3629,10 +3629,11 @@ virQEMUCapsFillDomainLoaderCaps(virQEMUCapsPtr qemuCaps,
         VIR_DOMAIN_CAPS_ENUM_SET(loader->readonly,
                                  VIR_TRISTATE_BOOL_YES,
                                  VIR_TRISTATE_BOOL_NO);
+    return 0;
 }
 
 
-static void
+static int
 virQEMUCapsFillDomainOSCaps(virQEMUCapsPtr qemuCaps,
                             virDomainCapsOSPtr os,
                             virArch arch)
@@ -3640,11 +3641,13 @@ virQEMUCapsFillDomainOSCaps(virQEMUCapsPtr qemuCaps,
     virDomainCapsLoaderPtr loader = &os->loader;
 
     os->device.supported = true;
-    virQEMUCapsFillDomainLoaderCaps(qemuCaps, loader, arch);
+    if (virQEMUCapsFillDomainLoaderCaps(qemuCaps, loader, arch) < 0)
+        return -1;
+    return 0;
 }
 
 
-static void
+static int
 virQEMUCapsFillDomainDeviceDiskCaps(virQEMUCapsPtr qemuCaps,
                                     virDomainCapsDeviceDiskPtr disk)
 {
@@ -3667,10 +3670,11 @@ virQEMUCapsFillDomainDeviceDiskCaps(virQEMUCapsPtr qemuCaps,
 
     if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_USB_STORAGE))
         VIR_DOMAIN_CAPS_ENUM_SET(disk->bus, VIR_DOMAIN_DISK_BUS_USB);
+    return 0;
 }
 
 
-static void
+static int
 virQEMUCapsFillDomainDeviceHostdevCaps(virQEMUCapsPtr qemuCaps,
                                        virDomainCapsDeviceHostdevPtr hostdev)
 {
@@ -3715,10 +3719,11 @@ virQEMUCapsFillDomainDeviceHostdevCaps(virQEMUCapsPtr qemuCaps,
                                  VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT,
                                  VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM);
     }
+    return 0;
 }
 
 
-void
+int
 virQEMUCapsFillDomainCaps(virDomainCapsPtr domCaps,
                           virQEMUCapsPtr qemuCaps)
 {
@@ -3729,7 +3734,9 @@ virQEMUCapsFillDomainCaps(virDomainCapsPtr domCaps,
 
     domCaps->maxvcpus = maxvcpus;
 
-    virQEMUCapsFillDomainOSCaps(qemuCaps, os, domCaps->arch);
-    virQEMUCapsFillDomainDeviceDiskCaps(qemuCaps, disk);
-    virQEMUCapsFillDomainDeviceHostdevCaps(qemuCaps, hostdev);
+    if (virQEMUCapsFillDomainOSCaps(qemuCaps, os, domCaps->arch) < 0 ||
+        virQEMUCapsFillDomainDeviceDiskCaps(qemuCaps, disk) < 0 ||
+        virQEMUCapsFillDomainDeviceHostdevCaps(qemuCaps, hostdev) < 0)
+        return -1;
+    return 0;
 }
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 0980c00..828bba3 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -324,7 +324,7 @@ int virQEMUCapsInitGuestFromBinary(virCapsPtr caps,
                                    virQEMUCapsPtr kvmbinCaps,
                                    virArch guestarch);
 
-void virQEMUCapsFillDomainCaps(virDomainCapsPtr domCaps,
-                               virQEMUCapsPtr qemuCaps);
+int virQEMUCapsFillDomainCaps(virDomainCapsPtr domCaps,
+                              virQEMUCapsPtr qemuCaps);
 
 #endif /* __QEMU_CAPABILITIES_H__*/
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 588eba4..9c1644c 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -17205,7 +17205,8 @@ qemuConnectGetDomainCapabilities(virConnectPtr conn,
     if (!(domCaps = virDomainCapsNew(emulatorbin, machine, arch, virttype)))
         goto cleanup;
 
-    virQEMUCapsFillDomainCaps(domCaps, qemuCaps);
+    if (virQEMUCapsFillDomainCaps(domCaps, qemuCaps) < 0)
+        goto cleanup;
 
     ret = virDomainCapsFormat(domCaps);
  cleanup:
diff --git a/tests/domaincapstest.c b/tests/domaincapstest.c
index f240643..0c4b09f 100644
--- a/tests/domaincapstest.c
+++ b/tests/domaincapstest.c
@@ -28,13 +28,13 @@
 
 #define VIR_FROM_THIS VIR_FROM_NONE
 
-typedef void (*virDomainCapsFill)(virDomainCapsPtr domCaps,
-                                  void *opaque);
+typedef int (*virDomainCapsFill)(virDomainCapsPtr domCaps,
+                                 void *opaque);
 
 #define SET_ALL_BITS(x) \
     memset(&(x.values), 0xff, sizeof(x.values))
 
-static void
+static int
 fillAll(virDomainCapsPtr domCaps,
         void *opaque ATTRIBUTE_UNUSED)
 {
@@ -60,18 +60,20 @@ fillAll(virDomainCapsPtr domCaps,
     SET_ALL_BITS(hostdev->subsysType);
     SET_ALL_BITS(hostdev->capsType);
     SET_ALL_BITS(hostdev->pciBackend);
+    return 0;
 }
 
 
 #ifdef WITH_QEMU
 # include "testutilsqemu.h"
-static void
+static int
 fillQemuCaps(virDomainCapsPtr domCaps,
              void *opaque)
 {
     virQEMUCapsPtr qemuCaps = (virQEMUCapsPtr) opaque;
 
-    virQEMUCapsFillDomainCaps(domCaps, qemuCaps);
+    if (virQEMUCapsFillDomainCaps(domCaps, qemuCaps) < 0)
+        return -1;
 
     /* The function above tries to query host's KVM & VFIO capabilities by
      * calling qemuHostdevHostSupportsPassthroughLegacy() and
@@ -82,6 +84,7 @@ fillQemuCaps(virDomainCapsPtr domCaps,
                              VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT,
                              VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM,
                              VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO);
+    return 0;
 }
 #endif /* WITH_QEMU */
 
@@ -99,8 +102,10 @@ buildVirDomainCaps(const char *emulatorbin,
     if (!(domCaps = virDomainCapsNew(emulatorbin, machine, arch, type)))
         goto cleanup;
 
-    if (fillFunc)
-        fillFunc(domCaps, opaque);
+    if (fillFunc && fillFunc(domCaps, opaque) < 0) {
+        virObjectUnref(domCaps);
+        domCaps = NULL;
+    }
 
  cleanup:
     return domCaps;