IRQ_DISABLE(9)                     Internal Functions Provided                     IRQ_DISABLE(9)



NAME
       irq_disable - Mark interrupt disabled

SYNOPSIS
       void irq_disable(struct irq_desc * desc);

ARGUMENTS
       desc
           irq descriptor which should be disabled

DESCRIPTION
       If the chip does not implement the irq_disable callback, we use a lazy disable approach.
       That means we mark the interrupt disabled, but leave the hardware unmasked. That's an
       optimization because we avoid the hardware access for the common case where no interrupt
       happens after we marked it disabled. If an interrupt happens, then the interrupt flow
       handler masks the line at the hardware level and marks it pending.

       If the interrupt chip does not implement the irq_disable callback, a driver can disable
       the lazy approach for a particular irq line by calling 'irq_set_status_flags(irq,
       IRQ_DISABLE_UNLAZY)'. This can be used for devices which cannot disable the interrupt at
       the device level under certain circumstances and have to use disable_irq[_nosync] instead.

AUTHORS
       Thomas Gleixner <tglx AT linutronix.de>
           Author.

       Ingo Molnar <mingo AT elte.hu>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                            IRQ_DISABLE(9)