[PATCH v3 2/6] PCI: aardvark: fix logic in advk_pcie_valid_device()

[Thomas Petazzoni]

From: Victor Gu <xigu at marvell.com>

The PCI configuration space read/write functions were special casing
the situation where PCI_SLOT(devfn) != 0, and returned
PCIBIOS_DEVICE_NOT_FOUND in this case.

However, while this is what is intended for the root bus, it is not
intended for the child busses, as it prevents discovering devices with
PCI_SLOT(x) != 0. Therefore, we return PCIBIOS_DEVICE_NOT_FOUND only
if we're on the root bus.

Fixes: 8c39d710363c1 ("PCI: aardvark: Add Aardvark PCI host controller driver")
Cc: <stable at vger.kernel.org>
Signed-off-by: Victor Gu <xigu at marvell.com>
Reviewed-by: Wilson Ding <dingwei at marvell.com>
Reviewed-by: Nadav Haklai <nadavh at marvell.com>
[Thomas: tweak commit log.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
Changes since v2:
 - The logic has been factorized into a advk_pcie_valid_device()
   helper in a previous patch, so this patch was adjusted accordingly.
---
 drivers/pci/host/pci-aardvark.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/host/pci-aardvark.c b/drivers/pci/host/pci-aardvark.c
index ccd0304a0c21..be140dc7109b 100644
--- a/drivers/pci/host/pci-aardvark.c
+++ b/drivers/pci/host/pci-aardvark.c
@@ -433,7 +433,7 @@ static int advk_pcie_wait_pio(struct advk_pcie *pcie)
 static int advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus,
 				  int devfn)
 {
-	if (PCI_SLOT(devfn) != 0)
+	if ((bus->number == pcie->root_bus_nr) && PCI_SLOT(devfn) != 0)
 		return false;
 
 	return true;
-- 
2.14.3