irqchip: armanda: Sanitize set_irq_affinity()

irqchip: armanda: Sanitize set_irq_affinity()

The set_irq_affinity() function has two issues:

1) It has no protection against selecting an offline cpu from the
   given mask.

2) It pointlessly restricts the affinity masks to have a single cpu
   set. This collides with the irq migration code of arm.

   irq affinity is set to core 3
   core 3 goes offline

   migration code sets mask to cpu_online_mask and calls the
   irq_set_affinity() callback of the irq_chip which fails due to bit
   0,1,2 set.

So instead of doing silly for_each_cpu() loops just pick any bit of
the mask which intersects with the online mask.

Get rid of fiddling with the default_irq_affinity as well.

[ Gregory: Fixed the access to the routing register ]

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Gregory CLEMENT <[email protected]>
Tested-by: Gregory CLEMENT <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>