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Evgeniy Dushistov 9ece8839b1 ARM: orion: Fix for certain sequence of request_irq can cause irq storm

The problem is that hardware handled by arm/plat-orion/gpio.c,
require ack for edge irq, and no ack for level irq.

The code handle this issue, by two "struct irq_chip_type" per
one "struct irq_chip_generic". For one "struct irq_chip_generic"
irq_ack pointer is setted, for another it is NULL.

But we have only one mask_cache per two "struct irq_chip_type".
So if we
1)unmask interrupt A for "edge type" trigger,
2)unmask interrupt B for "level type" trigger,
3)unmask interrupt C for "edge type",

we, because of usage of generic irq_gc_mask_clr_bit/irq_gc_mask_set_bit,
have hardware configured to trigger interrupt B on "edge type",
because of shared mask_cache. But kernel think that B is "level type",
so when interrupt B occur via "edge" reason, we don't ack it,
and B triggered again and again.

Signed-off-by: Evgeniy A. Dushistov <dushistov@mail.ru>
Link: https://lkml.kernel.org/r/20140726155659.GA22977@fifteen
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

2014-11-01 22:07:45 +00:00

include/plat

ARM: orion: remove no longer needed gpio DT code

2014-04-26 19:45:28 +00:00

common.c

dsa: Replace mii_bus with a generic host device

2014-09-15 17:24:20 -04:00

gpio.c

ARM: orion: Fix for certain sequence of request_irq can cause irq storm

2014-11-01 22:07:45 +00:00

irq.c

ARM: orion: remove no longer needed DT IRQ code