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efifb: Check efifb_pci_dev before using it 

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: a6c0fd3d5a ("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@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210413170508.968148-1-kai.heng.feng@canonical.com
This commit is contained in:
Kai-Heng Feng 2021-04-14 01:05:08 +08:00 committed by Alex Deucher
parent 6a3608eae6
commit d510c88cfb
1 changed files with 4 additions and 2 deletions
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6
drivers/video/fbdev/efifb.c
View File

@ -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;
}