linux-kernel - Re: [PATCH 2/3] drivers/base: reorder consumer and its children behind suppliers

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Message-ID: <20180627083445.jsu2ffyz5cl4wbjn@mwanda>
Date:   Wed, 27 Jun 2018 11:34:45 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     kbuild@...org, kbuild-all@...org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Christoph Hellwig <hch@...radead.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Dave Young <dyoung@...hat.com>, linux-pci@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/3] drivers/base: reorder consumer and its children
 behind suppliers

On Wed, Jun 27, 2018 at 10:34:54AM +0800, Pingfan Liu wrote:
> > 1b2a1e63 Pingfan Liu 2018-06-25  243            }
> > 1b2a1e63 Pingfan Liu 2018-06-25  244    }
> > 1b2a1e63 Pingfan Liu 2018-06-25 @245    BUG_ON(!ret);
> >
> > If the list is empty then "ret" can be unitialized.  We test a different
> > list "dev->links.suppliers" to see if that's empty.  I wrote a bunch of
> > code to make Smatch try to understand about empty lists, but I don't
> > think it works...
> >
> Yes, if list_empty, then the code can not touch ret. But ret is
> useless in this scene. Does it matter?
> 

I'm not sure I understand what you're asking?  Of course, it matters?

regards,
dan carpenter