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

Open Source and information security mailing list archives

Date:   Tue, 13 Apr 2021 20:37:29 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Alex Deucher <alexdeucher@...il.com>
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 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?
-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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