The simple answer would be we do not want to be interrupted during a interrupt handler. For SMP, there are other CPUs which can respond to IRQs. -daveti

On Nov 2, 2014, at 2:30 PM, mind entropy <mindentropy@gmail.com> wrote:

Hi,

When I do spin_lock_irq it disables IRQ's which were enabled. What is the reason for disabling all the irq's rather than disabling the specific IRQ line which shares the resource? Wouldn't this be more efficient and would not lose any interrupts especially if I have a critical sensor ADC?

Thanks, Gautam.

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