MIPS: Mark Eins: Fix cascading interrupt dispatcher

* Fix mis-calculated IRQ bitshift on cascading interrupts
* Prevent cascading interrupt from being processed afterward

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 file changed