[libvirt] [PATCH 6/6] nwfilter: Remove need for nwfilterDriverLock in some API's

[Michal Privoznik]

From: John Ferlan <jferlan at redhat.com>

Now that nwfilters object list is self locking, it's no longer
necessary to hold the driver level lock for certain API's.

Signed-off-by: John Ferlan <jferlan at redhat.com>
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/nwfilter/nwfilter_driver.c | 47 +++++++++++-------------------------------
 1 file changed, 12 insertions(+), 35 deletions(-)

diff --git a/src/nwfilter/nwfilter_driver.c b/src/nwfilter/nwfilter_driver.c
index 093844c9e..d49c32e4c 100644
--- a/src/nwfilter/nwfilter_driver.c
+++ b/src/nwfilter/nwfilter_driver.c
@@ -295,6 +295,10 @@ nwfilterStateReload(void)
     /* shut down all threads -- they will be restarted if necessary */
     virNWFilterLearnThreadsTerminate(true);
 
+    /* Serialization of virNWFilterObjListLoadAllConfigs is extremely
+     * important as it relates to virNWFilterObjListFindInstantiateFilter
+     * processing via virNWFilterTriggerVMFilterRebuild that occurs during
+     * virNWFilterObjListAssignDef */
     nwfilterDriverLock();
     virNWFilterWriteLockFilterUpdates();
     virNWFilterCallbackDriversLock();
@@ -452,11 +456,7 @@ nwfilterLookupByUUID(virConnectPtr conn,
     virNWFilterDefPtr def;
     virNWFilterPtr nwfilter = NULL;
 
-    nwfilterDriverLock();
-    obj = nwfilterObjFromNWFilter(uuid);
-    nwfilterDriverUnlock();
-
-    if (!obj)
+    if (!(obj = nwfilterObjFromNWFilter(uuid)))
         return NULL;
     def = virNWFilterObjGetDef(obj);
 
@@ -479,11 +479,7 @@ nwfilterLookupByName(virConnectPtr conn,
     virNWFilterDefPtr def;
     virNWFilterPtr nwfilter = NULL;
 
-    nwfilterDriverLock();
-    obj = virNWFilterObjListFindByName(driver->nwfilters, name);
-    nwfilterDriverUnlock();
-
-    if (!obj) {
+    if (!(obj = virNWFilterObjListFindByName(driver->nwfilters, name))) {
         virReportError(VIR_ERR_NO_NWFILTER,
                        _("no nwfilter with matching name '%s'"), name);
         return NULL;
@@ -517,17 +513,12 @@ nwfilterConnectListNWFilters(virConnectPtr conn,
                              char **const names,
                              int maxnames)
 {
-    int nnames;
-
     if (virConnectListNWFiltersEnsureACL(conn) < 0)
         return -1;
 
-    nwfilterDriverLock();
-    nnames = virNWFilterObjListGetNames(driver->nwfilters, conn,
-                                    virConnectListNWFiltersCheckACL,
-                                    names, maxnames);
-    nwfilterDriverUnlock();
-    return nnames;
+    return virNWFilterObjListGetNames(driver->nwfilters, conn,
+                                      virConnectListNWFiltersCheckACL,
+                                      names, maxnames);
 }
 
 
@@ -536,19 +527,13 @@ nwfilterConnectListAllNWFilters(virConnectPtr conn,
                                 virNWFilterPtr **nwfilters,
                                 unsigned int flags)
 {
-    int ret;
-
     virCheckFlags(0, -1);
 
     if (virConnectListAllNWFiltersEnsureACL(conn) < 0)
         return -1;
 
-    nwfilterDriverLock();
-    ret = virNWFilterObjListExport(conn, driver->nwfilters, nwfilters,
-                                   virConnectListAllNWFiltersCheckACL);
-    nwfilterDriverUnlock();
-
-    return ret;
+    return virNWFilterObjListExport(conn, driver->nwfilters, nwfilters,
+                                    virConnectListAllNWFiltersCheckACL);
 }
 
 static virNWFilterPtr
@@ -566,7 +551,6 @@ nwfilterDefineXML(virConnectPtr conn,
         return NULL;
     }
 
-    nwfilterDriverLock();
     virNWFilterWriteLockFilterUpdates();
     virNWFilterCallbackDriversLock();
 
@@ -594,7 +578,6 @@ nwfilterDefineXML(virConnectPtr conn,
 
     virNWFilterCallbackDriversUnlock();
     virNWFilterUnlockFilterUpdates();
-    nwfilterDriverUnlock();
     return nwfilter;
 }
 
@@ -606,7 +589,6 @@ nwfilterUndefine(virNWFilterPtr nwfilter)
     virNWFilterDefPtr def;
     int ret = -1;
 
-    nwfilterDriverLock();
     virNWFilterWriteLockFilterUpdates();
     virNWFilterCallbackDriversLock();
 
@@ -634,7 +616,6 @@ nwfilterUndefine(virNWFilterPtr nwfilter)
     virNWFilterObjEndAPI(&obj);
     virNWFilterCallbackDriversUnlock();
     virNWFilterUnlockFilterUpdates();
-    nwfilterDriverUnlock();
     return ret;
 }
 
@@ -649,11 +630,7 @@ nwfilterGetXMLDesc(virNWFilterPtr nwfilter,
 
     virCheckFlags(0, NULL);
 
-    nwfilterDriverLock();
-    obj = nwfilterObjFromNWFilter(nwfilter->uuid);
-    nwfilterDriverUnlock();
-
-    if (!obj)
+    if (!(obj = nwfilterObjFromNWFilter(nwfilter->uuid)))
         return NULL;
     def = virNWFilterObjGetDef(obj);
 
-- 
2.13.6