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authorStepan Moskovchenko <stepanm@codeaurora.org>2010-11-13 06:29:56 +0300
committerDaniel Walker <dwalker@codeaurora.org>2010-12-01 03:03:51 +0300
commit00d4b2bb03b9ed27f28336b0a68f2bd7f67caa40 (patch)
tree738995cfae9dbea6649668539561f97c3e86694f /arch/arm/mach-msm
parent2607b0a26094b2d2d174c3e27b2ecc9c49d86f40 (diff)
downloadlinux-00d4b2bb03b9ed27f28336b0a68f2bd7f67caa40.tar.xz
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>
Diffstat (limited to 'arch/arm/mach-msm')
-rw-r--r--arch/arm/mach-msm/iommu.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/iommu.c b/arch/arm/mach-msm/iommu.c
index 74f2157eba4e..67e8f531b7af 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;