[PATCH 1/1] UBUNTU: SAUCE: efifb: Check efifb_pci_dev before using it

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1922403

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 at canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210413170508.968148-1-kai.heng.feng@canonical.com
(cherry picked from commit d510c88cfbb294d2b1e2d0b71576e9b79d0e2e83 git://anongit.freedesktop.org/drm/drm-tip drm-tip)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 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