linux IRQ handler

 

Handle.c (kernel/irq) 13043 2011-1-19

 

/**

 * __do_IRQ - original all in one highlevel IRQ handler

 * @irq: the interrupt number

 *

 * __do_IRQ handles all normal device IRQ's (the special

 * SMP cross-CPU interrupts have their own specific

 * handlers).

 *

 * This is the original x86 implementation which is used for every

 * interrupt type.

 */

unsigned int __do_IRQ(unsigned int irq)

 

Since the IRQ_DISABLED flag is set, if the interrupt happens to fire
again, your handler shouldn't be called. The generic handler masks
interrupts when they occur, and if the IRQ_DISABLED flag is set then
it will leave the interrupt masked (i.e. disabled).