linux-kernel - Re: [PATCH v1] drm/bochs: fix an issue of ioremap() leak

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Date:   Wed, 22 Apr 2020 23:21:42 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     kraxel@...hat.com, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] drm/bochs: fix an issue of ioremap() leak

On Wed, Apr 22, 2020 at 05:40:51PM +0300, Andy Shevchenko wrote:
> On Wed, Apr 22, 2020 at 4:52 PM Dejin Zheng <zhengdejin5@...il.com> wrote:
> >
> > On Tue, Apr 21, 2020 at 08:24:24PM +0300, Andy Shevchenko wrote:
> > > On Tue, Apr 21, 2020 at 7:45 PM Dejin Zheng <zhengdejin5@...il.com> wrote:
> > > >
> > > > It forgot to call bochs_hw_fini() to release related resources when
> > > > bochs_pci_probe() fail. eg: io virtual address get by ioremap().
> > >
> > > Good start, although I think the best is to switch this driver to use
> > > pcim_*() functions and drop tons of legacy code.
> > >
> > Andy, thanks for your encouragement, I think we might be able to fix this
> > issue first, after that, drop tons of legacy code by pcim_*() functions.
> > Do you think it is ok?
> 
> It's really up to maintainer. I'm not the one here.
>
Thanks Andy.

Hi Gerd:

I am a newbie, andy gave me some directions to submit the patch, eg: check
ioremap leak. At this time, I found that the bochs driver may have similar
problems, so I submitted this patch, then, Andy said the best is to switch
this driver to use pcim _ * () functions and drop tons of legacy code.
I think we might be able to fix this issue first, after that, drop tons
of legacy code by pcim_*() functions. Can you give me some suggestions?
thank you very much!

BR,
Dejin

> > > > Fixes: 81da8c3b8d3df6 ("drm/bochs: add drm_driver.release callback.")
> > > > CC: Andy Shevchenko <andy.shevchenko@...il.com>
> > > > Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
> > > > ---
> > > >  drivers/gpu/drm/bochs/bochs_drv.c | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
> > > > index addb0568c1af..210a60135c8a 100644
> > > > --- a/drivers/gpu/drm/bochs/bochs_drv.c
> > > > +++ b/drivers/gpu/drm/bochs/bochs_drv.c
> > > > @@ -138,6 +138,7 @@ static int bochs_pci_probe(struct pci_dev *pdev,
> > > >         return ret;
> > > >
> > > >  err_unload:
> > > > +       bochs_hw_fini(dev);
> > > >         bochs_unload(dev);
> > > >  err_free_dev:
> > > >         drm_dev_put(dev);
> > > > --
> > > > 2.25.0
> > > >
> > >
> > >
> > > --
> > > With Best Regards,
> > > Andy Shevchenko
> 
> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko