iommu/vt-d: Use old domain parameter when attaching the blocking domain

blocking_domain_attach_dev() drops the old domain’s iopf reference using
info->domain, but that value may already be cleared by
device_block_translation().

On attach failure fallback paths, this can cause the function to drop a
NULL-domain ref instead of @old, leaking the real old-domain reference.
Repeated leaks grow info->iopf_refcount, keep the device stuck on the
iopf queue, and can trigger WARN_ON(info->iopf_refcount) when PRI is
disabled.

Use the core-provided @old parameter directly. It always identifies the
correct domain to release and matches other attach paths.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

0 files changed, 0 insertions, 0 deletions