[PATCH] drm/radeon/kms: make sure rio_mem is valid before unmapping it

[Alex Deucher]

If we were not able to map the io bar in device init, don't attempt
to unmap it in device fini.  All radeons should have a io bar, so
I doubt this would ever trigger, but just to be on the safe side...

Pointed out by: Alberto Milone <alberto.milone at canonical.com>
Signed-off-by: Alex Deucher <alexdeucher at gmail.com>
---
 drivers/gpu/drm/radeon/radeon_device.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index d3e86f4..9b092b6 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -737,7 +737,8 @@ void radeon_device_fini(struct radeon_device *rdev)
 	destroy_workqueue(rdev->wq);
 	vga_switcheroo_unregister_client(rdev->pdev);
 	vga_client_register(rdev->pdev, NULL, NULL, NULL);
-	pci_iounmap(rdev->pdev, rdev->rio_mem);
+	if (rdev->rio_mem)
+		pci_iounmap(rdev->pdev, rdev->rio_mem);
 	rdev->rio_mem = NULL;
 	iounmap(rdev->rmmio);
 	rdev->rmmio = NULL;
-- 
1.7.0.1