linux-kernel - [Debug 1/2] x86/PCI/ACPI: Ignore resources consumed by host bridge itself

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Message-Id: <1425289898-22377-2-git-send-email-jiang.liu@linux.intel.com>
Date:	Mon,  2 Mar 2015 17:51:37 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Voegtle <tv@...96.de>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Dave Airlie <airlied@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Lv Zheng <lv.zheng@...el.com>
Subject: [Debug 1/2] x86/PCI/ACPI: Ignore resources consumed by host bridge itself

When parsing resources for PCI host bridge, we should ignore resources
consumed by host bridge itself and only report window resources available
to child PCI busses.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 arch/x86/pci/acpi.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 6ac273832f28..ddafc9e8b9b3 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -331,7 +331,7 @@ static void probe_pci_root_info(struct pci_root_info *info,
 				struct list_head *list)
 {
 	int ret;
-	struct resource_entry *entry;
+	struct resource_entry *entry, *tmp;
 
 	sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
 	info->bridge = device;
@@ -345,8 +345,12 @@ static void probe_pci_root_info(struct pci_root_info *info,
 		dev_dbg(&device->dev,
 			"no IO and memory resources present in _CRS\n");
 	else
-		resource_list_for_each_entry(entry, list)
-			entry->res->name = info->name;
+		resource_list_for_each_entry_safe(entry, tmp, list) {
+			if (entry->res->flags & IORESOURCE_WINDOW)
+				entry->res->name = info->name;
+			else
+				resource_list_destroy_entry(entry);
+		}
 }
 
 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
-- 
1.7.10.4

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