The delayed irq disable functionality introduced a bug due to
retriggering level type interrupts in case of the delayed disable. The
resulting problem was discussed and debugged here:
http://marc.info/?l=linux-kernel&m=118202978609968&w=2
The resend of a level type interrupt is unnessecary and adds extra
noise to the system. Level type interrupts are resent by hardware when
they are still active at irq_enable(). The hard-/soft-ware resend is
only useful for edge type interrupts.
The following patch series addresses the problem and fixes an
unnoticed mismerge which affects the same area as well.
tglx
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