linux-kernel - Re: [PATCH 3.16 232/366] tracing: Deletion of an unnecessary check before iput()

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Date:   Sun, 14 Oct 2018 19:05:56 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Joe Perches <joe@...ches.com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     akpm@...ux-foundation.org,
        Markus Elfring <elfring@...rs.sourceforge.net>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 3.16 232/366] tracing: Deletion of an unnecessary check
 before iput()

On Sun, 2018-10-14 at 10:24 -0700, Joe Perches wrote:
> On Sun, 2018-10-14 at 16:25 +0100, Ben Hutchings wrote:
> > 3.16.60-rc1 review patch.  If anyone has any objections, please let me know.
> 
> I believe that no stable or backport kernel needs to
> apply patches like this unless it's needed for other
> real patches to be applied more easily.

This is only included so I could apply commit 0c92c7a3c5d4 "tracing:
Fix bad use of igrab in trace_uprobe.c" with fewer changes.

Ben.

> > ------------------
> > 
> > From: Markus Elfring <elfring@...rs.sourceforge.net>
> > 
> > commit 16a8ef2751801346f1f76a18685b2beb63cd170f upstream.
> > 
> > The iput() function tests whether its argument is NULL and then
> > returns immediately. Thus the test around the call is not needed.
> > 
> > This issue was detected by using the Coccinelle software.
> > 
> > Link: http://lkml.kernel.org/r/5468F875.7080907@users.sourceforge.net
> > 
> > Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> > Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> > ---
> >  kernel/trace/trace_uprobe.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > --- a/kernel/trace/trace_uprobe.c
> > +++ b/kernel/trace/trace_uprobe.c
> > @@ -552,8 +552,7 @@ error:
> >  	return ret;
> >  
> >  fail_address_parse:
> > -	if (inode)
> > -		iput(inode);
> > +	iput(inode);
> >  
> >  	pr_info("Failed to parse address or file.\n");
> >  
> > 
-- 
Ben Hutchings
I haven't lost my mind; it's backed up on tape somewhere.


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