[PATCH] radeon: Test for PCI root bus before assuming bus->self

[Alex Williamson]

If we assign a Radeon device to a virtual machine, we can no longer
assume a fixed hardware topology, like the GPU having a parent device.
This patch simply adds a few pci_is_root_bus() tests to avoid passing
a NULL pointer to PCI access functions, allowing the radeon driver to
work in a QEMU 440FX machine with an assigned HD8570 on the emulated
PCI root bus.

Signed-off-by: Alex Williamson <alex.williamson at redhat.com>
---

 drivers/gpu/drm/radeon/cik.c |    6 +++++-
 drivers/gpu/drm/radeon/si.c  |    6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 79a5a55..cc34308 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -9555,6 +9555,9 @@ static void cik_pcie_gen3_enable(struct radeon_device 
*rdev)
        int ret, i;
        u16 tmp16;

+       if (pci_is_root_bus(rdev->pdev->bus))
+               return;
+
        if (radeon_pcie_gen2 == 0)
                return;

@@ -9781,7 +9784,8 @@ static void cik_program_aspm(struct radeon_device *rdev)
                        if (orig != data)
                                WREG32_PCIE_PORT(PCIE_LC_LINK_WIDTH_CNTL, data);

-                       if (!disable_clkreq) {
+                       if (!disable_clkreq &&
+                           !pci_is_root_bus(rdev->pdev->bus)) {
                                struct pci_dev *root = rdev->pdev->bus->self;
                                u32 lnkcap;

diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index a1274a3..ffb1d4e 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -7177,6 +7177,9 @@ static void si_pcie_gen3_enable(struct radeon_device 
*rdev)
        int ret, i;
        u16 tmp16;

+       if (pci_is_root_bus(rdev->pdev->bus))
+               return;
+
        if (radeon_pcie_gen2 == 0)
                return;

@@ -7454,7 +7457,8 @@ static void si_program_aspm(struct radeon_device *rdev)
                        if (orig != data)
                                WREG32_PIF_PHY1(PB1_PIF_CNTL, data);

-                       if (!disable_clkreq) {
+                       if (!disable_clkreq &&
+                           !pci_is_root_bus(rdev->pdev->bus)) {
                                struct pci_dev *root = rdev->pdev->bus->self;
                                u32 lnkcap;