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From 9d97987c6cd5a7bf0dbd251d48b72b506bf0abe9 Mon Sep 17 00:00:00 2001
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Message-Id: <9d97987c6cd5a7bf0dbd251d48b72b506bf0abe9@dist-git>
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From: John Ferlan <jferlan@redhat.com>
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Date: Mon, 25 Jul 2016 12:42:53 -0400
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Subject: [PATCH] qemu: Alter error path cleanup for
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 qemuDomainAttachHostSCSIDevice
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https://bugzilla.redhat.com/show_bug.cgi?id=1301021
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Based on recent review comment - rather than have a spate of goto failxxxx,
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change to a boolean based model. Ensures that the original error can be
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preserved and cleanup is a bit more orderly if more objects are added.
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(cherry picked from commit 6fe2eb2458b5e4b84f5aede6d3fdf3ae47c0cd02)
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Signed-off-by: John Ferlan <jferlan@redhat.com>
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---
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 src/qemu/qemu_hotplug.c | 17 ++++++++---------
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 1 file changed, 8 insertions(+), 9 deletions(-)
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diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
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index 7a71333..3f63b0e 100644
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--- a/src/qemu/qemu_hotplug.c
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+++ b/src/qemu/qemu_hotplug.c
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@@ -1899,6 +1899,7 @@ qemuDomainAttachHostSCSIDevice(virConnectPtr conn,
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     char *drvstr = NULL;
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     bool teardowncgroup = false;
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     bool teardownlabel = false;
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+    bool driveAdded = false;
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     if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE_SCSI_GENERIC)) {
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         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
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@@ -1960,17 +1961,17 @@ qemuDomainAttachHostSCSIDevice(virConnectPtr conn,
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     if (VIR_REALLOC_N(vm->def->hostdevs, vm->def->nhostdevs + 1) < 0)
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         goto cleanup;
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-    /* Attach the device - 2 step process */
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     qemuDomainObjEnterMonitor(driver, vm);
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     if (qemuMonitorAddDrive(priv->mon, drvstr) < 0)
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-        goto failadddrive;
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+        goto exit_monitor;
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+    driveAdded = true;
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     if (qemuMonitorAddDevice(priv->mon, devstr) < 0)
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-        goto failadddevice;
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+        goto exit_monitor;
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     if (qemuDomainObjExitMonitor(driver, vm) < 0)
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-        goto failexitmonitor;
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+        goto cleanup;
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     virDomainAuditHostdev(vm, hostdev, "attach", true);
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@@ -1993,21 +1994,19 @@ qemuDomainAttachHostSCSIDevice(virConnectPtr conn,
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     VIR_FREE(devstr);
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     return ret;
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- failadddevice:
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+ exit_monitor:
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     orig_err = virSaveLastError();
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-    if (qemuMonitorDriveDel(priv->mon, drvstr) < 0)
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+    if (driveAdded && qemuMonitorDriveDel(priv->mon, drvstr) < 0) {
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         VIR_WARN("Unable to remove drive %s (%s) after failed "
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                  "qemuMonitorAddDevice",
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                  drvstr, devstr);
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+    }
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     if (orig_err) {
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         virSetError(orig_err);
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         virFreeError(orig_err);
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     }
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- failadddrive:
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     ignore_value(qemuDomainObjExitMonitor(driver, vm));
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-
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- failexitmonitor:
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     virDomainAuditHostdev(vm, hostdev, "attach", false);
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     goto cleanup;
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-- 
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2.9.2
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