linux-kernel - Re: [PATCH] mcheck: Correction to a missing return value from misc

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Message-ID: <1299313963.2779.3.camel@neoteric>
Date:	Sat, 05 Mar 2011 08:32:43 +0000
From:	"J.P. Lacerda" <jpl@...ethink.co.uk>
To:	Johan Wessfeldt <johan.wessfeldt@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, tglx@...utronix.de,
	mingo@...hat.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mcheck: Correction to a missing return value from
 misc_register

Hey Johan,

Sorry for the delayed reply.
Yes, we should go with yours (which you have already sent).

Kind regards,

J.P.

On Fri, 2011-03-04 at 18:50 +0100, Johan Wessfeldt wrote:
> Hi,
> 
> 
> I made another patch for this (yesterday) but  sent it to
> kernel-janitor list for a quick review. (as I'm new to this).
> 
> 
> JP. Lacerda, I noticed you also made a patch. It's very similar.
> Should I still send my patch in, or we go with yours?
> 
> 
> Regards.
> // Johan W.
> 
> 
> On Fri, Mar 4, 2011 at 5:44 PM, J.P. Lacerda <jpl@...ethink.co.uk>
> wrote:
>         Andrew,
>         
>         Where can a memory leak occur in sysdev_class_register()?
>         If one does occur, should the fix not be applied to
>         sysdev_class_register(), as opposed to mcheck_init_device()?
>         
>         Thanks,
>         
>         J.P.
>         
>         
>         On Wed, 2011-03-02 at 16:06 -0800, Andrew Morton wrote:
>         > On Mon, 28 Feb 2011 12:19:04 +0100
>         > Johan Wessfeldt <johan.wessfeldt@...il.com> wrote:
>         >
>         > > Return value from misc_register was not handled correctly
>         > > in mcheck_init_device()
>         > >
>         > > Signed-off-by: Johan Wessfeldt <johan.wessfeldt@...il.com>
>         > > ---
>         > >  arch/x86/kernel/cpu/mcheck/mce.c |    2 +-
>         > >  1 files changed, 1 insertions(+), 1 deletions(-)
>         > >
>         > > diff --git a/arch/x86/kernel/cpu/mcheck/mce.c
>         b/arch/x86/kernel/cpu/mcheck/mce.c
>         > > index d916183..7274a11 100644
>         > > --- a/arch/x86/kernel/cpu/mcheck/mce.c
>         > > +++ b/arch/x86/kernel/cpu/mcheck/mce.c
>         > > @@ -2140,7 +2140,7 @@ static __init int
>         mcheck_init_device(void)
>         > >     }
>         > >
>         > >     register_hotcpu_notifier(&mce_cpu_notifier);
>         > > -   misc_register(&mce_log_device);
>         > > +   err = misc_register(&mce_log_device);
>         > >
>         > >     return err;
>         > >  }
>         >
>         > It should be fixed, but not that way.  If misc_register()
>         fails here,
>         > mcheck_init_device() should undo all the things which it
>         just did.
>         >
>         > And the memory leak which occurs if sysdev_class_register()
>         fails and
>         > the memory and other resource leaks which occur if
>         mce_create_device()
>         > fails should be fixed too.
>         >
>         > mcheck_init_device() a rather optimistic function.
>         
>         > --
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>         
>         
> 
> 


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