linux-kernel - [PATCH] mtip32xx: Prefer pcie_capability_read

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Message-Id: <20190718020745.8867-6-fred@fredlawl.com>
Date:   Wed, 17 Jul 2019 21:07:41 -0500
From:   Frederick Lawler <fred@...dlawl.com>
To:     axboe@...nel.dk
Cc:     Frederick Lawler <fred@...dlawl.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, bhelgaas@...gle.com
Subject: [PATCH] mtip32xx: Prefer pcie_capability_read_word()

Commit 8c0d3a02c130 ("PCI: Add accessors for PCI Express Capability")
added accessors for the PCI Express Capability so that drivers didn't
need to be aware of differences between v1 and v2 of the PCI
Express Capability.

Replace pci_read_config_word() and pci_write_config_word() calls with
pcie_capability_read_word() and pcie_capability_write_word().

Signed-off-by: Frederick Lawler <fred@...dlawl.com>
---
 drivers/block/mtip32xx/mtip32xx.c | 28 ++++++++++++----------------
 1 file changed, 12 insertions(+), 16 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index f0105d118056..b7b26e33248b 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3952,22 +3952,18 @@ static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
 	int pos;
 	unsigned short pcie_dev_ctrl;
 
-	pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
-	if (pos) {
-		pci_read_config_word(pdev,
-			pos + PCI_EXP_DEVCTL,
-			&pcie_dev_ctrl);
-		if (pcie_dev_ctrl & (1 << 11) ||
-		    pcie_dev_ctrl & (1 << 4)) {
-			dev_info(&dd->pdev->dev,
-				"Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
-					pdev->vendor, pdev->device);
-			pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
-						PCI_EXP_DEVCTL_RELAX_EN);
-			pci_write_config_word(pdev,
-				pos + PCI_EXP_DEVCTL,
-				pcie_dev_ctrl);
-		}
+	if (!pci_is_pcie(pdev))
+		return;
+
+	pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctrl);
+	if (pcie_dev_ctrl & (1 << 11) ||
+	    pcie_dev_ctrl & (1 << 4)) {
+		dev_info(&dd->pdev->dev,
+			 "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
+			 pdev->vendor, pdev->device);
+		pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
+					PCI_EXP_DEVCTL_RELAX_EN);
+		pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, pcie_dev_ctrl);
 	}
 }
 
-- 
2.17.1