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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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