linux-kernel - Re: [PATCH net] device property: change device_get_phy

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Message-ID: <20200131082451.GD11068@kadam>
Date:   Fri, 31 Jan 2020 11:24:51 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ajay Gupta <ajayg@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Iyappan Subramanian <iyappan@...amperecomputing.com>,
        Keyur Chudgar <keyur@...amperecomputing.com>,
        Quan Nguyen <quan@...amperecomputing.com>,
        Steve Glendinning <steve.glendinning@...well.net>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] device property: change device_get_phy_mode() to
 prevent signedess bugs

On Fri, Jan 31, 2020 at 10:15:14AM +0200, Andy Shevchenko wrote:
> On Fri, Jan 31, 2020 at 7:03 AM Dan Carpenter <dan.carpenter@...cle.com> wrote:
> >
> > The device_get_phy_mode() was returning negative error codes on
> > failure and positive phy_interface_t values on success.  The problem is
> > that the phy_interface_t type is an enum which GCC treats as unsigned.
> > This lead to recurring signedness bugs where we check "if (phy_mode < 0)"
> > and "phy_mode" is unsigned.
> >
> > In the commit 0c65b2b90d13 ("net: of_get_phy_mode: Change API to solve
> > int/unit warnings") we updated of_get_phy_mode() take a pointer to
> > phy_mode and only return zero on success and negatives on failure.  This
> > patch does the same thing for device_get_phy_mode().  Plus it's just
> > nice for the API to be the same in both places.
> 
> 
> > +       err = device_get_phy_mode(dev, &config->phy_interface);
> 
> > +       if (err)
> > +               config->phy_interface = PHY_INTERFACE_MODE_NA;
> 
> Do you need these? It seems the default settings when error appears.
> 

We don't need it, but I thought it made things more readable.

regards,
dan carpenter