linux-kernel - Re: [PATCH v4 3/4] device property: constify property arrays values

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Message-ID: <20170203010607.GB12651@dtor-ws>
Date:   Thu, 2 Feb 2017 17:06:07 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Joe Perches <joe@...ches.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH v4 3/4] device property: constify property arrays values

On Fri, Feb 03, 2017 at 01:37:25AM +0100, Rafael J. Wysocki wrote:
> On Fri, Feb 3, 2017 at 1:16 AM, Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
> > On Fri, Feb 03, 2017 at 12:16:29AM +0100, Rafael J. Wysocki wrote:
> >> On Thu, Feb 2, 2017 at 7:38 PM, Dmitry Torokhov
> >> <dmitry.torokhov@...il.com> wrote:
> >> > On Thu, Feb 02, 2017 at 07:52:58PM +0200, Andy Shevchenko wrote:
> >> >> On Thu, 2017-02-02 at 09:07 -0800, Dmitry Torokhov wrote:
> >> >> > On February 2, 2017 8:48:30 AM PST, Andy Shevchenko <andriy.shevchenko
> >> >> > @linux.intel.com> wrote:
> >> >> > > On Thu, 2017-02-02 at 08:39 -0800, Dmitry Torokhov wrote:
> >> >> > > > From: Dmitry Torokhov <dmitry.torokhov@...il.com>
> >> >> > > >
> >> >> > > > Data that is fed into property arrays should not be modified, so
> >> >> > >
> >> >> > > let's
> >> >> > > > mark
> >> >> > > > relevant pointers as const. This will allow us making source
> >> >> > > > arrays
> >> >> > >
> >> >> > > as
> >> >> > > > const/__initconst.
> >> >> > > >
> >> >> > > > Also fix memory leaks on errors in property_entry_copy().
> >> >> > >
> >> >> > > While the code looks okay, I'm not sure what memory leaks you are
> >> >> > > referring to. The idea as far as I remember was to run *free()
> >> >> > > function
> >> >> > > if *copy() fails.
> >> >> >
> >> >> > That could have been OK for internal function, but will not work for
> >> >> > public API, as it goes against normal pattern.
> >>
> >> But it is an internal function, isn't it?
> >>
> >> Also its only caller does the right thing AFAICS.
> >
> > No, actually property_entries_dup() does not do the right thing anymore
> > :(.
> 
> Well, it looks like this is because of patch [1/4], so IMO the changes
> to clean up on errors in property_entry_copy() should be made in that
> patch as well.
> 
> Right now we seem to have potential memory leaks introduced in patch
> [1/4] and then fixed up in patch [3/4] in the same series which
> doesn't feel quite right to be honest.

Totally agree, I'm reshuffling and will repost the series in a few.

-- 
Dmitry