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msm: iommu: Check if device is already attached 

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>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
This commit is contained in:
Stepan Moskovchenko 2010-11-12 19:29:56 -08:00 committed by Daniel Walker
parent 2607b0a260
commit 00d4b2bb03
1 changed files with 5 additions and 0 deletions
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5
arch/arm/mach-msm/iommu.c
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@ -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;