The WARN_ON() was introduced in commit 272e4f99 ("iommu/amd: WARN
when __[attach|detach]_device are called with irqs enabled") to ensure
that the domain->lock is taken in proper irqs disabled context. This
is required, because the domain->lock is taken as well in irq
context.

The proper context check by the WARN_ON() is redundant, because it is
already covered by LOCKDEP. When working with locks and changing
context, a run with LOCKDEP is required anyway and would detect the
wrong lock context.

Furthermore all callers for those functions are within the same file
and all callers acquire another lock which already disables interrupts.
Signed-off-by: NAnna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>