linux-kernel - [PATCH v3 20/32] PCI/niu: use PCIe capabilities access functions to simplify implementation

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Message-Id: <1343836477-7287-21-git-send-email-jiang.liu@huawei.com>
Date:	Wed,  1 Aug 2012 23:54:25 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Don Dutile <ddutile@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	Jiang Liu <jiang.liu@...wei.com>, Yinghai Lu <yinghai@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Yijing Wang <wangyijing@...wei.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Jiang Liu <liuj97@...il.com>
Subject: [PATCH v3 20/32] PCI/niu: use PCIe capabilities access functions to simplify implementation

From: Jiang Liu <jiang.liu@...wei.com>

Use PCIe capabilities access functions to simplify niu driver's
implementation.

Signed-off-by: Jiang Liu <liuj97@...il.com>
---
 drivers/net/ethernet/sun/niu.c |   18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index 703c8cc..e8e2932 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -9768,9 +9768,8 @@ static int __devinit niu_pci_init_one(struct pci_dev *pdev,
 	union niu_parent_id parent_id;
 	struct net_device *dev;
 	struct niu *np;
-	int err, pos;
+	int err;
 	u64 dma_mask;
-	u16 val16;
 
 	niu_driver_version();
 
@@ -9793,8 +9792,7 @@ static int __devinit niu_pci_init_one(struct pci_dev *pdev,
 		goto err_out_disable_pdev;
 	}
 
-	pos = pci_pcie_cap(pdev);
-	if (pos <= 0) {
+	if (!pci_is_pcie(pdev)) {
 		dev_err(&pdev->dev, "Cannot find PCI Express capability, aborting\n");
 		goto err_out_free_res;
 	}
@@ -9819,14 +9817,10 @@ static int __devinit niu_pci_init_one(struct pci_dev *pdev,
 		goto err_out_free_dev;
 	}
 
-	pci_read_config_word(pdev, pos + PCI_EXP_DEVCTL, &val16);
-	val16 &= ~PCI_EXP_DEVCTL_NOSNOOP_EN;
-	val16 |= (PCI_EXP_DEVCTL_CERE |
-		  PCI_EXP_DEVCTL_NFERE |
-		  PCI_EXP_DEVCTL_FERE |
-		  PCI_EXP_DEVCTL_URRE |
-		  PCI_EXP_DEVCTL_RELAX_EN);
-	pci_write_config_word(pdev, pos + PCI_EXP_DEVCTL, val16);
+	pci_pcie_capability_change_word(pdev, PCI_EXP_DEVCTL,
+		PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE |
+		PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE |
+		PCI_EXP_DEVCTL_RELAX_EN, PCI_EXP_DEVCTL_NOSNOOP_EN);
 
 	dma_mask = DMA_BIT_MASK(44);
 	err = pci_set_dma_mask(pdev, dma_mask);
-- 
1.7.9.5

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