linux-kernel - Re: [PATCH 5.10 100/122] gpio: mpc8xxx: Fix a potential double iounmap call in mpc8xxx

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Message-ID: <20210922210014.GA27285@amd>
Date:   Wed, 22 Sep 2021 23:00:15 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Pavel Machek <pavel@...x.de>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.10 100/122] gpio: mpc8xxx: Fix a potential double
 iounmap call in mpc8xxx_probe()

Hi!

> > > > Commit 76c47d1449fc ("gpio: mpc8xxx: Add ACPI support") has switched to a
> > > > managed version when dealing with 'mpc8xxx_gc->regs'. So the corresponding
> > > > 'iounmap()' call in the error handling path and in the remove should be
> > > > removed to avoid a double unmap.
> > > 
> > > This is wrong, AFAICT. 5.10 does not have 76c47d1449fc ("gpio:
> > > mpc8xxx: Add ACPI support") so iounmap is still neccessary and this
> > > adds a memory leak.
> > 
> > Ah, but then I have to drop 889a1b3f35db ("gpio: mpc8xxx: Use
> > 'devm_gpiochip_add_data()' to simplify the code and avoid a leak") from
> > the 5.10 queue as it depends on this one.
> > 
> > Can you provide a working backport of that commit so that I can queue up
> > the fix?
> 
> Oh nevermind, I fixed it up myself.

Thank you!
								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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