As the card-detect irq handler just schedules work to be done by a
thread, we can use request_threaded_irq to do much of the work for
us.  This means that interrupts which arrive by handle_nested_irq
actually work.
Reviewed-by: NFelipe Balbi <balbi@ti.com>
Tested-by: NGrazvydas Ignotas <notasas@gmail.com>
Signed-off-by: NNeilBrown <neilb@suse.de>
Acked-by: NKishore Kadiyala <kishorek.kadiyala@gmail.com>
Signed-off-by: NChris Ball <cjb@laptop.org>