tree fcaa96123a1917e6488ed182e255fdd64df6a04d
parent ec11d63c677bbba15e65a35f5ba06c1d6eba4dbe
author Will Deacon <will.deacon@arm.com> 1437065412 +0100
committer Will Deacon <will.deacon@arm.com> 1438339105 +0100

iommu/arm-smmu: Limit 2-level strtab allocation for small SID sizes

If the StreamIDs in a system can all be resolved by a single level-2
stream table (i.e. SIDSIZE < SPLIT), then we currently get our maths
wrong and allocate the largest strtab we support, thanks to unsigned
overflow in our calculation.

This patch fixes the issue by checking the SIDSIZE explicitly when
calculating the size of our first-level stream table.

Reported-by: Matt Evans <matt.evans@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>