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    Subject[PATCH 5.5 006/150] iommu/vt-d: Simplify check in identity_mapping()
    Date
    From: Joerg Roedel <jroedel@suse.de>

    commit 1ddb32da4a629fa7f87873d0b6836c2e1feb7518 upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/iommu/intel-iommu.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/iommu/intel-iommu.c
    +++ b/drivers/iommu/intel-iommu.c
    @@ -2799,7 +2799,7 @@ static int identity_mapping(struct devic
    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;

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