[libvirt] [PATCH 8/9] Consolidate "cont" into qemudMonitorSendCont().

[Miloslav Trmač <mitr@xxxxxxxxxx>]

Also fix a potential infinite loop in qemuDomainCoreDump() if sending
cont repeatedly fails.
---
 src/qemu_driver.c |   43 ++++++++++++++++++-------------------------
 1 files changed, 18 insertions(+), 25 deletions(-)

diff --git a/src/qemu_driver.c b/src/qemu_driver.c
index 12079f8..9ead5fd 100644
--- a/src/qemu_driver.c
+++ b/src/qemu_driver.c
@@ -128,6 +128,7 @@ static int qemudMonitorCommandExtra(const virDomainObjPtr vm,
                                     const char *extra,
                                     const char *extraPrompt,
                                     char **reply);
+static int qemudMonitorSendCont(const virDomainObjPtr vm);
 static int qemudDomainSetMemoryBalloon(virConnectPtr conn,
                                        virDomainObjPtr vm,
                                        unsigned long newmem);
@@ -1199,7 +1200,6 @@ static int
 qemudInitCpus(virConnectPtr conn,
               virDomainObjPtr vm,
               const char *migrateFrom) {
-    char *info = NULL;
 #if HAVE_SCHED_GETAFFINITY
     cpu_set_t mask;
     int i, maxcpu = QEMUD_CPUMASK_LEN;
@@ -1235,12 +1235,11 @@ qemudInitCpus(virConnectPtr conn,
 
     if (migrateFrom == NULL) {
         /* Allow the CPUS to start executing */
-        if (qemudMonitorCommand(vm, "cont", &info) < 0) {
+        if (qemudMonitorSendCont(vm) < 0) {
             qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
                              "%s", _("resume operation failed"));
             return -1;
         }
-        VIR_FREE(info);
     }
 
     return 0;
@@ -2172,6 +2171,17 @@ qemudMonitorCommand(const virDomainObjPtr vm,
     return qemudMonitorCommandExtra(vm, cmd, NULL, NULL, reply);
 }
 
+static int
+qemudMonitorSendCont(const virDomainObjPtr vm) {
+    char *reply;
+
+    if (qemudMonitorCommand(vm, "cont", &reply) < 0)
+        return -1;
+    qemudDebug ("%s: cont reply: %s", vm->def->name, info);
+    VIR_FREE(reply);
+    return 0;
+}
+
 
 
 static virDrvOpenStatus qemudOpen(virConnectPtr conn,
@@ -2633,7 +2643,6 @@ cleanup:
 
 static int qemudDomainResume(virDomainPtr dom) {
     struct qemud_driver *driver = dom->conn->privateData;
-    char *info;
     virDomainObjPtr vm;
     int ret = -1;
     virDomainEventPtr event = NULL;
@@ -2654,17 +2663,15 @@ static int qemudDomainResume(virDomainPtr dom) {
         goto cleanup;
     }
     if (vm->state == VIR_DOMAIN_PAUSED) {
-        if (qemudMonitorCommand(vm, "cont", &info) < 0) {
+        if (qemudMonitorSendCont(vm) < 0) {
             qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
                              "%s", _("resume operation failed"));
             goto cleanup;
         }
         vm->state = VIR_DOMAIN_RUNNING;
-        qemudDebug("Reply %s", info);
         event = virDomainEventNewFromObj(vm,
                                          VIR_DOMAIN_EVENT_RESUMED,
                                          VIR_DOMAIN_EVENT_RESUMED_UNPAUSED);
-        VIR_FREE(info);
     }
     if (virDomainSaveStatus(dom->conn, driver->stateDir, vm) < 0)
         goto cleanup;
@@ -3349,13 +3356,9 @@ cleanup:
        will support synchronous operations so we always get here after
        the migration is complete.  */
     if (resume && paused) {
-        if (qemudMonitorCommand(vm, "cont", &info) < 0) {
+        if (qemudMonitorSendCont(vm) < 0)
             qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
                              "%s", _("resuming after dump failed"));
-            goto cleanup;
-        }
-        DEBUG ("%s: cont reply: %s", vm->def->name, info);
-        VIR_FREE(info);
     }
     if (vm)
         virDomainObjUnlock(vm);
@@ -3824,13 +3827,11 @@ static int qemudDomainRestore(virConnectPtr conn,
 
     /* If it was running before, resume it now. */
     if (header.was_running) {
-        char *info;
-        if (qemudMonitorCommand(vm, "cont", &info) < 0) {
+        if (qemudMonitorSendCont(vm) < 0) {
             qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
                              "%s", _("failed to resume domain"));
             goto cleanup;
         }
-        VIR_FREE(info);
         vm->state = VIR_DOMAIN_RUNNING;
     }
     ret = 0;
@@ -5645,14 +5646,9 @@ qemudDomainMigratePerform (virDomainPtr dom,
     ret = 0;
 
 cleanup:
-    /* Note that we have to free info *first*, since we are re-using the
-     * variable below (and otherwise might cause a memory leak)
-     */
-    VIR_FREE(info);
-
     if (paused) {
         /* we got here through some sort of failure; start the domain again */
-        if (qemudMonitorCommand (vm, "cont", &info) < 0) {
+        if (qemudMonitorSendCont(vm) < 0) {
             /* Hm, we already know we are in error here.  We don't want to
              * overwrite the previous error, though, so we just throw something
              * to the logs and hope for the best
@@ -5660,16 +5656,13 @@ cleanup:
             VIR_ERROR(_("Failed to resume guest %s after failure\n"),
                       vm->def->name);
         }
-        else {
-            DEBUG ("%s: cont reply: %s", vm->def->name, info);
-            VIR_FREE(info);
-        }
 
         event = virDomainEventNewFromObj(vm,
                                          VIR_DOMAIN_EVENT_RESUMED,
                                          VIR_DOMAIN_EVENT_RESUMED_MIGRATED);
     }
 
+    VIR_FREE(info);
     if (vm)
         virDomainObjUnlock(vm);
     if (event)
-- 
1.6.2.5

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