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iommu/arm-smmu: fix capability checking prior to device attach 

If somebody attempts to check the capability of an IOMMU domain prior to
device attach, then we'll try to dereference a NULL SMMU pointer through
the SMMU domain (since we can't determine the actual SMMU instance until
we have a device attached).

This patch fixes the capability check so that non-global features are
reported as being absent when no device is attached to the domain.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2014-07-04 11:06:01 +01:00
parent 9c5c92e35c
commit d3bca16635
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/arm-smmu.c
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@ -1509,7 +1509,8 @@ static int arm_smmu_domain_has_cap(struct iommu_domain *domain,
unsigned long cap)
{
struct arm_smmu_domain *smmu_domain = domain->priv;
u32 features = smmu_domain->smmu->features;
struct arm_smmu_device *smmu = smmu_domain->smmu;
u32 features = smmu ? smmu->features : 0;
switch (cap) {
case IOMMU_CAP_CACHE_COHERENCY: