diff options
| author |   Stepan Moskovchenko <stepanm@codeaurora.org> | 2010-11-12 19:29:56 -0800 |
|---|---|---|
| committer |   Daniel Walker <dwalker@codeaurora.org> | 2010-11-30 16:03:51 -0800 |
| commit | 00d4b2bb03b9ed27f28336b0a68f2bd7f67caa40 (patch) | |
| tree | 738995cfae9dbea6649668539561f97c3e86694f | |
| parent | msm: iommu: Kconfig item for cacheable page tables (diff) | |
| download | linux-dev-00d4b2bb03b9ed27f28336b0a68f2bd7f67caa40.tar.xz linux-dev-00d4b2bb03b9ed27f28336b0a68f2bd7f67caa40.zip | |
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>
| -rw-r--r-- | 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 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; |