linux-kernel - Re: [PATCH] efifb: Check efifb_pci_dev before using it

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Message-ID: <CADnq5_MpDz9myx8HiKihq-6_Ud48sN=NXN1_ga7WZa9LguzSjA@mail.gmail.com>
Date:   Tue, 13 Apr 2021 18:36:17 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "open list:EFIFB FRAMEBUFFER DRIVER" <linux-fbdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <dri-devel@...ts.freedesktop.org>,
        pjones@...hat.com, Thomas Zimmermann <tzimmermann@...e.de>,
        Alex Deucher <alexander.deucher@....com>
Subject: Re: [PATCH] efifb: Check efifb_pci_dev before using it

On Tue, Apr 13, 2021 at 2:37 PM Daniel Vetter <daniel@...ll.ch> wrote:
>
> On Tue, Apr 13, 2021 at 8:02 PM Alex Deucher <alexdeucher@...il.com> wrote:
> >
> > On Tue, Apr 13, 2021 at 1:05 PM Kai-Heng Feng
> > <kai.heng.feng@...onical.com> wrote:
> > >
> > > On some platforms like Hyper-V and RPi4 with UEFI firmware, efifb is not
> > > a PCI device.
> > >
> > > So make sure efifb_pci_dev is found before using it.
> > >
> > > Fixes: a6c0fd3d5a8b ("efifb: Ensure graphics device for efifb stays at PCI D0")
> > > BugLink: https://bugs.launchpad.net/bugs/1922403
> > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> >
> > Reviewed-by: Alex Deucher <alexander.deucher@....com>
>
> fbdev is in drm-misc, so maybe you can push this one too?

Yes, pushed.  Thanks!

Alex

> -Daniel
>
> >
> > > ---
> > >  drivers/video/fbdev/efifb.c | 6 ++++--
> > >  1 file changed, 4 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
> > > index f58a545b3bf3..8ea8f079cde2 100644
> > > --- a/drivers/video/fbdev/efifb.c
> > > +++ b/drivers/video/fbdev/efifb.c
> > > @@ -575,7 +575,8 @@ static int efifb_probe(struct platform_device *dev)
> > >                 goto err_fb_dealoc;
> > >         }
> > >         fb_info(info, "%s frame buffer device\n", info->fix.id);
> > > -       pm_runtime_get_sync(&efifb_pci_dev->dev);
> > > +       if (efifb_pci_dev)
> > > +               pm_runtime_get_sync(&efifb_pci_dev->dev);
> > >         return 0;
> > >
> > >  err_fb_dealoc:
> > > @@ -602,7 +603,8 @@ static int efifb_remove(struct platform_device *pdev)
> > >         unregister_framebuffer(info);
> > >         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
> > >         framebuffer_release(info);
> > > -       pm_runtime_put(&efifb_pci_dev->dev);
> > > +       if (efifb_pci_dev)
> > > +               pm_runtime_put(&efifb_pci_dev->dev);
> > >
> > >         return 0;
> > >  }
> > > --
> > > 2.30.2
> > >
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@...ts.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@...ts.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

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