From 00d4b2bb03b9ed27f28336b0a68f2bd7f67caa40 Mon Sep 17 00:00:00 2001 From: Stepan Moskovchenko Date: Fri, 12 Nov 2010 19:29:56 -0800 Subject: [PATCH] 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 Signed-off-by: Daniel Walker --- arch/arm/mach-msm/iommu.c | 5 +++++ 1 file changed, 5 insertions(+) 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; -- 2.34.1