linux-kernel - [PATCH 02/13] PCI: Introduce new pci_is

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Message-ID: <1398417515-8740-3-git-send-email-wangyijing@huawei.com>
Date:	Fri, 25 Apr 2014 17:18:24 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>, <linux-ia64@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	<sparclinux@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>,
	<x86@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Yijing Wang <wangyijing@...wei.com>
Subject: [PATCH 02/13] PCI: Introduce new pci_is_bridge() helper function

PCIe Spec define the PCI bridge is the PCI device
which header type(bit 0 through 6) is 0x1(PCI bridge)
or 0x2(CardBus bridge).

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 include/linux/pci.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index aab57b4..827077a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -477,6 +477,12 @@ static inline bool pci_is_root_bus(struct pci_bus *pbus)
 	return !(pbus->parent);
 }
 
+static inline bool pci_is_bridge(struct pci_dev *dev)
+{
+	return dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+		dev->hdr_type == PCI_HEADER_TYPE_CARDBUS;
+}
+
 static inline struct pci_dev *pci_upstream_bridge(struct pci_dev *dev)
 {
 	dev = pci_physfn(dev);
-- 
1.7.1


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