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    Subject[PATCH 05/21] AMD IOMMU: add domain id free function
    Date
    Impact: add code to release a domain id

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kernel/amd_iommu.c | 10 ++++++++++
    1 files changed, 10 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
    index 85a62e9..11de0f1 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -569,6 +569,16 @@ static u16 domain_id_alloc(void)
    return id;
    }

    +static void domain_id_free(int id)
    +{
    + unsigned long flags;
    +
    + write_lock_irqsave(&amd_iommu_devtable_lock, flags);
    + if (id > 0 && id < MAX_DOMAIN_ID)
    + __clear_bit(id, amd_iommu_pd_alloc_bitmap);
    + write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
    +}
    +
    /*
    * Used to reserve address ranges in the aperture (e.g. for exclusion
    * ranges.
    --
    1.5.6.4



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