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    Subject[PATCH 10/14] msm: iommu: Check if device is already attached
    Date
    An IOMMU device can only be attached to one IOMMU domain at
    any given time. Check whether the device is already
    attached to a domain before allowing it to be attached to
    another domain. If so, return busy.

    Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
    ---
    arch/arm/mach-msm/iommu.c | 5 +++++
    1 files changed, 5 insertions(+), 0 deletions(-)

    diff --git a/arch/arm/mach-msm/iommu.c b/arch/arm/mach-msm/iommu.c
    index 74f2157..67e8f53 100644
    --- a/arch/arm/mach-msm/iommu.c
    +++ b/arch/arm/mach-msm/iommu.c
    @@ -241,6 +241,11 @@ static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
    goto fail;
    }

    + if (!list_empty(&ctx_drvdata->attached_elm)) {
    + ret = -EBUSY;
    + goto fail;
    + }
    +
    list_for_each_entry(tmp_drvdata, &priv->list_attached, attached_elm)
    if (tmp_drvdata == ctx_drvdata) {
    ret = -EBUSY;
    --
    1.7.0.2
    Sent by an employee of the Qualcomm Innovation Center, Inc.
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.



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