fix #26319040

commit 2a78f9962565e53b78363eaf516eb052009e8020 upstream.

The traversing of this list requires protection_domain->lock to be taken
to avoid nasty races with attach/detach code. Make sure the lock is held
on all code-paths traversing this list.
Reported-by: NFilippo Sironi <sironi@amazon.de>
Fixes: 92d420ec ("iommu/amd: Relax locking in dma_ops path")
Reviewed-by: NFilippo Sironi <sironi@amazon.de>
Reviewed-by: NJerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>
Signed-off-by: Ntianyi <fujunkang@linux.alibaba.com>
Reviewed-by: Nzhangliguang <zhangliguang@linux.alibaba.com>
Acked-by: Nzhangliguang <zhangliguang@linux.alibaba.com>