irqchip: armanda: Sanitize set_irq_affinity()
authorThomas Gleixner <tglx@linutronix.de>
Tue, 4 Mar 2014 20:43:41 +0000 (20:43 +0000)
committerThomas Gleixner <tglx@linutronix.de>
Mon, 28 Apr 2014 19:27:15 +0000 (21:27 +0200)
commit8cc3cfc5ccf1680b7c88f874912b6bec2797b76b
tree33658295928340d76ca4ce6c30f488c49c7f8043
parent62a08ae2a5763aabeee98264605236b001503e0c
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 <tglx@linutronix.de>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Link: http://lkml.kernel.org/r/20140304203101.088889302@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
drivers/irqchip/irq-armada-370-xp.c