virNetDevBandwidthClear: Improve error handling

Two changes are introduced in this patch:

 - The first change removes ATTRIBUTE_RETURN_CHECK from
   virNetDevBandwidthClear, because it was called with ignore_value
   always, anyway. The function is used even when it's not necessary
   to call it, just for cleanup purposes.

 - The second change is added ignoring of the command's exit status,
   since it may report an error even when run just as "to be sure we
   clean up" function. No libvirt errors are suppresed by this.

src/network/bridge_driver.c

@@ -2161,7 +2161,7 @@ networkStartNetworkVirtual(struct network_driver *driver,
     return 0;
 
  err5:
-    ignore_value(virNetDevBandwidthClear(network->def->bridge));
+    virNetDevBandwidthClear(network->def->bridge);
 
  err4:
     if (!save_err)
@@ -2206,7 +2206,7 @@ networkStartNetworkVirtual(struct network_driver *driver,
 static int networkShutdownNetworkVirtual(struct network_driver *driver,
                                         virNetworkObjPtr network)
 {
-    ignore_value(virNetDevBandwidthClear(network->def->bridge));
+    virNetDevBandwidthClear(network->def->bridge);
 
     if (network->radvdPid > 0) {
         char *radvdpidbase;

src/util/virnetdevbandwidth.c

 /*
- * Copyright (C) 2009-2011 Red Hat, Inc.
+ * Copyright (C) 2009-2012 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -69,7 +69,7 @@ virNetDevBandwidthSet(const char *ifname,
         goto cleanup;
     }
 
-    ignore_value(virNetDevBandwidthClear(ifname));
+    virNetDevBandwidthClear(ifname);
 
     if (bandwidth->in) {
         if (virAsprintf(&average, "%llukbps", bandwidth->in->average) < 0)
@@ -166,12 +166,13 @@ int
 virNetDevBandwidthClear(const char *ifname)
 {
     int ret = 0;
+    int dummy; /* for ignoring the exit status */
     virCommandPtr cmd = NULL;
 
     cmd = virCommandNew(TC);
     virCommandAddArgList(cmd, "qdisc", "del", "dev", ifname, "root", NULL);
 
-    if (virCommandRun(cmd, NULL) < 0)
+    if (virCommandRun(cmd, &dummy) < 0)
         ret = -1;
 
     virCommandFree(cmd);
@@ -179,8 +180,9 @@ virNetDevBandwidthClear(const char *ifname)
     cmd = virCommandNew(TC);
     virCommandAddArgList(cmd, "qdisc",  "del", "dev", ifname, "ingress", NULL);
 
-    if (virCommandRun(cmd, NULL) < 0)
+    if (virCommandRun(cmd, &dummy) < 0)
         ret = -1;
+
     virCommandFree(cmd);
 
     return ret;

src/util/virnetdevbandwidth.h

 /*
- * Copyright (C) 2009-2011 Red Hat, Inc.
+ * Copyright (C) 2009-2012 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -44,7 +44,7 @@ void virNetDevBandwidthFree(virNetDevBandwidthPtr def);
 int virNetDevBandwidthSet(const char *ifname, virNetDevBandwidthPtr bandwidth)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
 int virNetDevBandwidthClear(const char *ifname)
-    ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
+    ATTRIBUTE_NONNULL(1);
 int virNetDevBandwidthCopy(virNetDevBandwidthPtr *dest, const virNetDevBandwidthPtr src)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;