linux-kernel - [PATCH 3/6] IB/qib: Use pci_is_root_bus() to check whether it is a root bus

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Date:	Mon, 9 Sep 2013 21:13:05 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Airlie <airlied@...ux.ie>,
	Mike Marciniszyn <infinipath@...el.com>,
	Roland Dreier <roland@...nel.org>,
	Roland Dreier <roland@...estorage.com>
CC:	<linux-kernel@...r.kernel.org>, Mark Einon <mark.einon@...il.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	<linux-rdma@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: [PATCH 3/6] IB/qib: Use pci_is_root_bus() to check whether it is a root bus

Use pci_is_root_bus() instead of "if (bus->parent)" statement
for better readability.

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 drivers/infiniband/hw/qib/qib_pcie.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/infiniband/hw/qib/qib_pcie.c b/drivers/infiniband/hw/qib/qib_pcie.c
index c574ec7..3a5b99b 100644
--- a/drivers/infiniband/hw/qib/qib_pcie.c
+++ b/drivers/infiniband/hw/qib/qib_pcie.c
@@ -590,7 +590,7 @@ static int qib_tune_pcie_caps(struct qib_devdata *dd)
 
 	/* Find out supported and configured values for parent (root) */
 	parent = dd->pcidev->bus->self;
-	if (parent->bus->parent) {
+	if (!pci_is_root_bus(parent->bus)) {
 		qib_devinfo(dd->pcidev, "Parent not root\n");
 		goto bail;
 	}
-- 
1.7.1


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