From: Vasant Hegde <vasant.hegde@xxxxxxx> commit f451c7a5a3b818ecfeba2ba258570769998baf3a upstream. If device->domain is same as new domain then we can skip the device attach process. Signed-off-by: Vasant Hegde <vasant.hegde@xxxxxxx> Link: https://lore.kernel.org/r/20230215052642.6016-2-vasant.hegde@xxxxxxx Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Cc: "Limonciello, Mario" <Mario.Limonciello@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/iommu/amd/iommu.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2161,6 +2161,13 @@ static int amd_iommu_attach_device(struc struct amd_iommu *iommu = rlookup_amd_iommu(dev); int ret; + /* + * Skip attach device to domain if new domain is same as + * devices current domain + */ + if (dev_data->domain == domain) + return 0; + dev_data->defer_attach = false; if (dev_data->domain)
