linux-kernel - [PATCH 12/13] PCI: Only treat non-pref mmio64 as pref if host bridge has mmio64

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Message-Id: <20170421050500.13957-13-yinghai@kernel.org>
Date:   Thu, 20 Apr 2017 22:04:59 -0700
From:   Yinghai Lu <yinghai@...nel.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        David Miller <davem@...emloft.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Wei Yang <weiyang@...ux.vnet.ibm.com>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 12/13] PCI: Only treat non-pref mmio64 as pref if host bridge has mmio64

If host bridge does not have mmio64 above 4G, We don't need to
treat device non-pref mmio64 as as pref mmio64.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Tested-by: Khalid Aziz <khalid.aziz@...cle.com>
---
 drivers/pci/setup-bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index b3fd314..7a0e59b 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -738,7 +738,7 @@ int pci_claim_bridge_resource(struct pci_dev *bridge, int i)
 static bool pci_up_path_over_pref_mem64(struct pci_bus *bus)
 {
 	if (pci_is_root_bus(bus))
-		return true;
+		return to_pci_host_bridge(bus->bridge)->has_mem64;
 
 	if (bus->self) {
 		int i;
-- 
2.9.3