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Commit 82fcfc67 authored by Yijing Wang's avatar Yijing Wang Committed by Joerg Roedel
Browse files

iommu/amd: Clean up unnecessary MSI/MSI-X capability find 



PCI core will initialize device MSI/MSI-X capability in
pci_msi_init_pci_dev(). So device driver should use
pci_dev->msi_cap/msix_cap to determine whether the device
support MSI/MSI-X instead of using
pci_find_capability(pci_dev, PCI_CAP_ID_MSI/MSIX).  Access
to PCIe device config space again will consume more time.

Signed-off-by: default avatarYijing Wang <wangyijing@huawei.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarJoerg Roedel <joro@8bytes.org>
parent d4e4ab86

drivers/iommu/amd_iommu_init.c

+1 −1
Original line number Diff line number Diff line
@@ -1384,7 +1384,7 @@ static int iommu_init_msi(struct amd_iommu *iommu) 
	if (iommu->int_enabled)

		goto enable_faults;



	if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))

	if (iommu->dev->msi_cap)

		ret = iommu_setup_msi(iommu);

	else

		ret = -ENODEV;