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From 94f286f826e5f4c2bee9364245872cc17e0e89f1 Mon Sep 17 00:00:00 2001
From: Victor Gu <xigu@marvell.com>
Date: Fri, 8 Sep 2017 11:53:42 +0200
Subject: [PATCH 05/14] PCI: aardvark: fix logic in PCI configuration
read/write functions
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, will 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@vger.kernel.org>
Signed-off-by: Victor Gu <xigu@marvell.com>
Reviewed-by: Wilson Ding <dingwei@marvell.com>
Reviewed-by: Nadav Haklai <nadavh@marvell.com>
[Thomas: tweak commit log.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
drivers/pci/host/pci-aardvark.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/host/pci-aardvark.c b/drivers/pci/host/pci-aardvark.c
index 20f1d048582f..0dbaadfe88e0 100644
--- a/drivers/pci/host/pci-aardvark.c
+++ b/drivers/pci/host/pci-aardvark.c
@@ -441,7 +441,7 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
u32 reg;
int ret;
- if (PCI_SLOT(devfn) != 0) {
+ if ((bus->number == pcie->root_bus_nr) && (PCI_SLOT(devfn) != 0)) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
@@ -495,7 +495,7 @@ static int advk_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
int offset;
int ret;
- if (PCI_SLOT(devfn) != 0)
+ if ((bus->number == pcie->root_bus_nr) && (PCI_SLOT(devfn) != 0))
return PCIBIOS_DEVICE_NOT_FOUND;
if (where % size)
--
2.15.0
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