linux-kernel - Re: [PATCH] net: allwinner: Fix some resources leak in the error handling path of the probe and in the remove function

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Date:   Tue, 15 Dec 2020 20:08:15 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>, davem@...emloft.net,
        kuba@...nel.org, wens@...e.org, jernej.skrabec@...l.net,
        timur@...nel.org, song.bao.hua@...ilicon.com, f.fainelli@...il.com,
        leon@...nel.org, hkallweit1@...il.com, wangyunjian@...wei.com,
        sr@...x.de, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] net: allwinner: Fix some resources leak in the error
 handling path of the probe and in the remove function

On Tue, Dec 15, 2020 at 07:18:48PM +0100, Christophe JAILLET wrote:
> Le 15/12/2020 à 12:37, Maxime Ripard a écrit :
> > On Tue, Dec 15, 2020 at 12:11:53PM +0300, Dan Carpenter wrote:
> > > On Tue, Dec 15, 2020 at 09:56:55AM +0100, Maxime Ripard wrote:
> > > > Hi,
> > > > 
> > > > On Mon, Dec 14, 2020 at 09:21:17PM +0100, Christophe JAILLET wrote:
> > > > > 'irq_of_parse_and_map()' should be balanced by a corresponding
> > > > > 'irq_dispose_mapping()' call. Otherwise, there is some resources leaks.
> > > > 
> > > > Do you have a source to back that? It's not clear at all from the
> > > > documentation for those functions, and couldn't find any user calling it
> > > > from the ten-or-so random picks I took.
> > > 
> > > It looks like irq_create_of_mapping() needs to be freed with
> > > irq_dispose_mapping() so this is correct.
> > 
> > The doc should be updated first to make that clear then, otherwise we're
> > going to fix one user while multiples will have poped up
> > 
> > Maxime
> > 
> 
> Hi,
> 
> as Dan explained, I think that 'irq_dispose_mapping()' is needed because of
> the 'irq_create_of_mapping()" within 'irq_of_parse_and_map()'.
> 
> As you suggest, I'll propose a doc update to make it clear and more future
> proof.

Thanks :)

And if you feel like it, a coccinelle script would be awesome too so
that other users get fixed over time

Maxime

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