Re: [Qemu-devel] [PATCH 07/20 v2] target-i386: cpu_x86_register() consolidate freeing resources

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 19 Dec 2012 15:04:37 -0200
Eduardo Habkost <ehabkost@redhat.com> wrote:

> On Wed, Dec 19, 2012 at 05:49:22PM +0100, Igor Mammedov wrote:
> > On Wed, 19 Dec 2012 14:36:28 -0200
> > Eduardo Habkost <ehabkost@redhat.com> wrote:
> > 
> > > On Tue, Dec 18, 2012 at 05:30:43PM +0100, Igor Mammedov wrote:
> > > > freeing resources in one place would require setting 'error'
> > > > to not NULL, so add some more error reporting before jumping to
> > > > exit branch.
> > > > 
> > > > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > > > ---
> > > >   v2:
> > > >    - add missing 'return -1' on exit if error is not NULL,
> > > >            Spotted-By: Eduardo Habkost <ehabkost@redhat.com>
> > > > ---
> > > >  target-i386/cpu.c |   17 ++++++++---------
> > > >  1 files changed, 8 insertions(+), 9 deletions(-)
> > > > 
> > > > diff --git a/target-i386/cpu.c b/target-i386/cpu.c
> > > > index 3b9bbfe..fe8b76c 100644
> > > > --- a/target-i386/cpu.c
> > > > +++ b/target-i386/cpu.c
> > > > @@ -1550,13 +1550,14 @@ int cpu_x86_register(X86CPU *cpu, const char
> > > > *cpu_model) 
> > > >      model_pieces = g_strsplit(cpu_model, ",", 2);
> > > >      if (!model_pieces[0]) {
> > > > -        goto error;
> > > > +        goto out;
> > > 
> > > Missing error_set*() call here.
> > Thinking about this error path, it looks like it's unreachable, because of
> > every caller of cpu_init() passes in not empty cpu_model.
> 
> Not empty, or just non-NULL? I just hit the check above using -cpu "".
> 
> Note that the above check catches both NULL and empty cpu_model strings,
> because g_strsplit("", ...) returns an empty array.
I see, I'll add error message here then.


Thanks!

> 
> 
> > Perhaps it would make sense to just assert(cpu_model) at the beginning of
> > function and delete this error check.
> > 
> > > 
> > > The rest of the patch looks good, to me. I liked this style of handling
> > > errors & freeing resources.
> > > 
> > > 
> > [snip]
> > 
> > 
>