linux-kernel - Re: [PATCH v2 4/4] staging: media: zoran: replace dprintk with new debugging macros

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Message-ID: <20220506071455.GC4031@kadam>
Date:   Fri, 6 May 2022 10:14:55 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Ian Cowan <ian@...ux.cowan.aero>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Corentin Labbe <clabbe@...libre.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        mjpeg-users@...ts.sourceforge.net, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] staging: media: zoran: replace dprintk with new
 debugging macros

On Fri, May 06, 2022 at 01:30:12AM -0400, Ian Cowan wrote:
> On Thu, Apr 28, 2022 at 10:15:03AM +0200, Hans Verkuil wrote:
> > Hi Ian,
> > 
> > When I compiled this patch series with smatch I got these warnings:
> > 
> > zoran/videocodec.c:45 videocodec_attach() warn: variable dereferenced before check 'master' (see line 40)
> > zoran/videocodec.c:115 videocodec_detach() warn: variable dereferenced before check 'codec' (see line 111)
> > zoran/videocodec.c:168 videocodec_register() warn: variable dereferenced before check 'codec' (see line 166)
> > zoran/videocodec.c:200 videocodec_unregister() warn: variable dereferenced before check 'codec' (see line 198)
> > 
> > And I also got this warning when checking the kerneldoc:
> > 
> > zoran/zoran.h:307: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
> > 
> > Can you fix this and post a v3?
> > 
> > Thanks!
> > 
> > 	Hans
> 
> I just resubmitted v3.
> 
> What did you use to see these issues? When I ran the checkpatch script
> and compiled, I did not see any of this.
> 

I have written a blog entry about checking kernel code with Smatch:

https://staticthinking.wordpress.com/2022/04/25/how-to-run-smatch-on-your-code/

regards,
dan carpenter