[libvirt] [PATCH v2 6/8] qemuDomainEventQueue: Check if event is non-NULL

[Jiri Denemark]

On Thu, Sep 17, 2015 at 18:24:29 -0400, John Ferlan wrote:
> 
> 
> On 09/11/2015 09:26 AM, Jiri Denemark wrote:
> > Every single call to qemuDomainEventQueue() uses the following pattern:
> > 
> >     if (event)
> >         qemuDomainEventQueue(driver, event);
> > 
> > Let's move the check for valid event to qemuDomainEventQueue and
> > simplify all callers.
> > 
> > Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
> > ---
> > 
> > Notes:
> >     Version 2:
> >     - no change
> > 
> >  src/qemu/qemu_blockjob.c  |  6 ++--
> >  src/qemu/qemu_cgroup.c    |  3 +-
> >  src/qemu/qemu_domain.c    |  6 ++--
> >  src/qemu/qemu_driver.c    | 87 ++++++++++++++++-------------------------------
> >  src/qemu/qemu_hotplug.c   | 26 ++++++--------
> >  src/qemu/qemu_migration.c | 24 +++++--------
> >  src/qemu/qemu_process.c   | 72 +++++++++++++--------------------------
> >  7 files changed, 78 insertions(+), 146 deletions(-)
> > 
> 
> Yay!  A couple still are behind "if (event) {" in qemu_driver
> (qemuDomainCreateXML, qemuDomainRevertToSnapshot) as well as an if

There are two events involved in both functions ("event" and "event2")
and we can send event2 only if event is not NULL, which is the reason
for
    if (event) {
        qemuDomainEventQueue(driver, event);
        qemuDomainEventQueue(driver, event2);
    }

It would be possible to rewrite it as

    qemuDomainEventQueue(driver, event);
    if (event)
        qemuDomainEventQueue(driver, event2);

but I think the original version is slightly better.

> (event_old) and if (event_new) in qemuDomainRename

Yeah, both came in after I originally created this patch. I will clean
them before pushing.

Jirka