Refactor virDomainHostdevFind method

Move the code for matching hostdev instances out of virDomainHostdevFind
and into virDomainHostdevMatch method, which in turn calls out to other
helper methods depending on the type of hostdev.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/conf/domain_conf.c

@@ -7885,6 +7885,69 @@ virDomainHostdevRemove(virDomainDefPtr def, size_t i)
     return hostdev;
 }
 
+
+static int
+virDomainHostdevMatchSubsysUSB(virDomainHostdevDefPtr a,
+                               virDomainHostdevDefPtr b)
+{
+    if (b->source.subsys.u.usb.bus && b->source.subsys.u.usb.device) {
+        /* specified by bus location on host */
+        if (a->source.subsys.u.usb.bus == b->source.subsys.u.usb.bus &&
+            a->source.subsys.u.usb.device == b->source.subsys.u.usb.device)
+            return 1;
+    } else {
+        /* specified by product & vendor id */
+        if (a->source.subsys.u.usb.product == b->source.subsys.u.usb.product &&
+            a->source.subsys.u.usb.vendor == b->source.subsys.u.usb.vendor)
+            return 1;
+    }
+    return 0;
+}
+
+static int
+virDomainHostdevMatchSubsysPCI(virDomainHostdevDefPtr a,
+                               virDomainHostdevDefPtr b)
+{
+    if (a->source.subsys.u.pci.domain == b->source.subsys.u.pci.domain &&
+        a->source.subsys.u.pci.bus == b->source.subsys.u.pci.bus &&
+        a->source.subsys.u.pci.slot == b->source.subsys.u.pci.slot &&
+        a->source.subsys.u.pci.function == b->source.subsys.u.pci.function)
+        return 1;
+    return 0;
+}
+
+
+static int
+virDomainHostdevMatchSubsys(virDomainHostdevDefPtr a,
+                            virDomainHostdevDefPtr b)
+{
+    if (a->source.subsys.type != b->source.subsys.type)
+        return 0;
+
+    switch (a->source.subsys.type) {
+    case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
+        return virDomainHostdevMatchSubsysPCI(a, b);
+    case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
+        return virDomainHostdevMatchSubsysUSB(a, b);
+    }
+    return 0;
+}
+
+
+static int
+virDomainHostdevMatch(virDomainHostdevDefPtr a,
+                      virDomainHostdevDefPtr b)
+{
+    if (a->mode != b->mode)
+        return 0;
+
+    switch (a->mode) {
+    case VIR_DOMAIN_HOSTDEV_MODE_SUBSYS:
+        return virDomainHostdevMatchSubsys(a, b);
+    }
+    return 0;
+}
+
 /* Find an entry in hostdevs that matches the source spec in
  * @match. return pointer to the entry in @found (if found is
  * non-NULL). Returns index (within hostdevs) of matched entry, or -1
@@ -7896,58 +7959,17 @@ virDomainHostdevFind(virDomainDefPtr def,
                      virDomainHostdevDefPtr *found)
 {
     virDomainHostdevDefPtr local_found;
-    virDomainHostdevSubsysPtr m_subsys = &match->source.subsys;
     int i;
 
     if (!found)
         found = &local_found;
     *found = NULL;
 
-    /* There is no code that uses _MODE_CAPABILITIES, and nothing to
-     * compare if it did, so don't allow it.
-     */
-    if (match->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
-        return -1;
-
     for (i = 0 ; i < def->nhostdevs ; i++) {
-        virDomainHostdevDefPtr compare = def->hostdevs[i];
-        virDomainHostdevSubsysPtr c_subsys = &compare->source.subsys;
-
-        if (compare->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS ||
-            c_subsys->type != m_subsys->type) {
-            continue;
-        }
-
-        switch (m_subsys->type)
-        {
-        case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
-            if (c_subsys->u.pci.domain == m_subsys->u.pci.domain &&
-                c_subsys->u.pci.bus == m_subsys->u.pci.bus &&
-                c_subsys->u.pci.slot == m_subsys->u.pci.slot &&
-                c_subsys->u.pci.function == m_subsys->u.pci.function) {
-                *found = compare;
-            }
-                break;
-        case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
-            if (m_subsys->u.usb.bus && m_subsys->u.usb.device) {
-                /* specified by bus location on host */
-                if (c_subsys->u.usb.bus == m_subsys->u.usb.bus &&
-                    c_subsys->u.usb.device == m_subsys->u.usb.device) {
-                    *found = compare;
-                }
-            } else {
-                /* specified by product & vendor id */
-                if (c_subsys->u.usb.product == m_subsys->u.usb.product &&
-                    c_subsys->u.usb.vendor == m_subsys->u.usb.vendor) {
-                    *found = compare;
-                }
-            }
-            break;
-        default:
+        if (virDomainHostdevMatch(match, def->hostdevs[i])) {
+            *found = def->hostdevs[i];
             break;
         }
-        if (*found)
-            break;
     }
     return *found ? i : -1;
 }