[RFC PATCH v2, part 2 13/18] PCI, DRM: use hotplug-safe iterators to walk PCI buses

[Jiang Liu]

Enhance DRM drvier to use hotplug-safe iterators to walk PCI buses.

Signed-off-by: Jiang Liu <jiang.liu at huawei.com>
Cc: David Airlie <airlied at linux.ie>
Cc: dri-devel at lists.freedesktop.org
Cc: linux-kernel at vger.kernel.org
---
 drivers/gpu/drm/drm_fops.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 13fdcd1..04f3bcd 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -357,9 +357,11 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
 			pci_dev_put(pci_dev);
 		}
 		if (!dev->hose) {
-			struct pci_bus *b = pci_bus_b(pci_root_buses.next);
-			if (b)
+			struct pci_bus *b = pci_get_next_root_bus(NULL);
+			if (b) {
 				dev->hose = b->sysdata;
+				pci_bus_put(b);
+			}
 		}
 	}
 #endif
-- 
1.8.1.2