linux-kernel - [PATCH] PCI/VFIO: use pcie_flags_reg instead of access PCI-E Capabilities Register

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Message-ID: <1364375140-6388-1-git-send-email-wangyijing@huawei.com>
Date:	Wed, 27 Mar 2013 17:05:40 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, <linux-kernel@...r.kernel.org>,
	Hanjun Guo <guohanjun@...wei.com>, <jiang.liu@...wei.com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: [PATCH] PCI/VFIO: use pcie_flags_reg instead of access PCI-E Capabilities Register

Currently, we use pcie_flags_reg to cache PCI-E Capabilities Register,
because PCI-E Capabilities Register bits are almost read-only. This patch
use pcie_flags_reg instead of another access PCI-E Capabilities Register.

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 drivers/vfio/pci/vfio_pci_config.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index aeb00fc..afc6ca4 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -1017,13 +1017,9 @@ static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
 		return byte;
 	case PCI_CAP_ID_EXP:
 		/* length based on version */
-		ret = pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &word);
-		if (ret)
-			return pcibios_err_to_errno(ret);
-
 		vdev->extended_caps = true;
 
-		if ((word & PCI_EXP_FLAGS_VERS) == 1)
+		if ((pdev->pcie_flags_reg & PCI_EXP_FLAGS_VERS) == 1)
 			return PCI_CAP_EXP_ENDPOINT_SIZEOF_V1;
 		else
 			return PCI_CAP_EXP_ENDPOINT_SIZEOF_V2;
-- 
1.7.1


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