linux-kernel - Re: Re: [PATCH] drm/nouveau/clk/gm20b: Fix memory leak in gm20b_clk

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Message-ID: <5d580094.f274c.17277fc124e.Coremail.dinghao.liu@zju.edu.cn>
Date:   Wed, 3 Jun 2020 10:21:47 +0800 (GMT+08:00)
From:   dinghao.liu@....edu.cn
To:     "Dan Carpenter" <dan.carpenter@...cle.com>
Cc:     "Markus Elfring" <Markus.Elfring@....de>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Ben Skeggs" <bskeggs@...hat.com>,
        "David Airlie" <airlied@...ux.ie>, "Kangjie Lu" <kjlu@....edu>
Subject: Re: Re: [PATCH] drm/nouveau/clk/gm20b: Fix memory leak in
 gm20b_clk_new()


> On Tue, Jun 02, 2020 at 01:10:34PM +0200, Markus Elfring wrote:
> > > The original patch was basically fine.
> > 
> > I propose to reconsider the interpretation of the software situation once more.
> > 
> > * Should the allocated clock object be kept usable even after
> >   a successful return from this function?
> 
> Heh.  You're right.  The patch is freeing "clk" on the success path so
> that doesn't work.
> 

Ben has explained this problem:
https://lore.kernel.org/patchwork/patch/1249592/
Since the caller will check "pclk" on failure, we don't need to free
"clk" in gm20b_clk_new() and I think this patch is no longer needed.

Regards,
Dinghao