iommu/vt-d: Simplify check in identity_mapping()

BugLink: https://bugs.launchpad.net/bugs/1922738
The function only has one call-site and there it is never called with
dummy or deferred devices. Simplify the check in the function to
account for that.

Fixes: 1ee0186b9a12 ("iommu/vt-d: Refactor find_domain() helper")
Cc: stable@vger.kernel.org # v5.5
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
(cherry picked from commit 1ddb32da4a629fa7f87873d0b6836c2e1feb7518)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Guilherme G. Piccoli <gpiccoli@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0067bc2faf1bf3eb31949dc7d75aed5547281ab0..ebb874fe6dbb43c5310ec0a1cd2f420ab6a6172c 100644 (file)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2801,7 +2801,7 @@ static int identity_mapping(struct device *dev)
        struct device_domain_info *info;
 
        info = dev->archdata.iommu;
-       if (info && info != DUMMY_DEVICE_DOMAIN_INFO && info != DEFER_DEVICE_DOMAIN_INFO)
+       if (info)
                return (info->domain == si_domain);
 
        return 0;