[PATCH v3, part2 14/20] 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 429e07d..dc8c40b 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -359,9 +359,11 @@ 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