iommu/qcom: Fix bogus detach logic

Currently, the implementation of qcom_iommu_domain_free() is guaranteed
to do one of two things: WARN() and leak everything, or dereference NULL
and crash. That alone is terrible, but in fact the whole idea of trying
to track the liveness of a domain via the qcom_domain->iommu pointer as
a sanity check is full of fundamentally flawed assumptions. Make things
robust and actually functional by not trying to be quite so clever.

Reported-by: Brian Masney <[email protected]>
Tested-by: Brian Masney <[email protected]>
Reported-by: Naresh Kamboju <[email protected]>
Fixes: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu")
Signed-off-by: Robin Murphy <[email protected]>
Tested-by: Stephan Gerhold <[email protected]>
Cc: [email protected] # v4.14+
Signed-off-by: Joerg Roedel <[email protected]>

0 files changed, 0 insertions, 0 deletions