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Take spinlock when entering ISR and timer routine to ensure that we do not race while enabling/disabling FIFO interrupts. Also we do not need to take teh spinlock in tegra_kbc_startremove() since interrupt is completely disabled. Tested-by: Rakesh Iyer <riyer@nvidia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>