[libvirt] [PATCH 2/7] qemu: Alter error path cleanup for qemuDomainAttachVirtioDiskDevice

[John Ferlan]

Based on recent review comment - rather than have a spate of goto failxxxx,
change to a boolean based model. Ensures that the original error can be
preserved and cleanup is a bit more orderly if more objects are added.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/qemu/qemu_hotplug.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 10120aa..ce1db3c 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -308,6 +308,7 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
     char *drivestr = NULL;
     char *drivealias = NULL;
     bool releaseaddr = false;
+    bool cleanupAddDrive = false;
     virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
     const char *src = virDomainDiskGetSource(disk);
 
@@ -354,18 +355,18 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
     if (VIR_REALLOC_N(vm->def->disks, vm->def->ndisks+1) < 0)
         goto error;
 
-    /* Attach the device - 2 step process */
     qemuDomainObjEnterMonitor(driver, vm);
 
     if (qemuMonitorAddDrive(priv->mon, drivestr) < 0)
-        goto failadddrive;
+        goto monitor_error;
+    cleanupAddDrive = true;
 
     if (qemuMonitorAddDevice(priv->mon, devstr) < 0)
-        goto failadddevice;
+        goto monitor_error;
 
     if (qemuDomainObjExitMonitor(driver, vm) < 0) {
         releaseaddr = false;
-        goto failexitmonitor;
+        goto error;
     }
 
     virDomainAuditDisk(vm, NULL, disk->src, "attach", true);
@@ -381,22 +382,19 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
     virObjectUnref(cfg);
     return ret;
 
- failadddevice:
+ monitor_error:
     orig_err = virSaveLastError();
-    if (qemuMonitorDriveDel(priv->mon, drivealias) < 0) {
+    if (cleanupAddDrive && qemuMonitorDriveDel(priv->mon, drivealias) < 0) {
         VIR_WARN("Unable to remove drive %s (%s) after failed "
                  "qemuMonitorAddDevice", drivealias, drivestr);
     }
+    if (qemuDomainObjExitMonitor(driver, vm) < 0)
+        releaseaddr = false;
     if (orig_err) {
         virSetError(orig_err);
         virFreeError(orig_err);
     }
 
- failadddrive:
-    if (qemuDomainObjExitMonitor(driver, vm) < 0)
-        releaseaddr = false;
-
- failexitmonitor:
     virDomainAuditDisk(vm, NULL, disk->src, "attach", false);
 
  error:
-- 
2.5.5