centos man page for free_irq

FREE_IRQ(9)						     Public Functions Provided						       FREE_IRQ(9)

NAME
       free_irq - free an interrupt allocated with request_irq

SYNOPSIS
       void free_irq(unsigned int irq, void * dev_id);

ARGUMENTS
       irq
	   Interrupt line to free

       dev_id
	   Device identity to free

DESCRIPTION
       Remove an interrupt handler. The handler is removed and if the interrupt line is no longer in use by any driver it is disabled. On a shared
       IRQ the caller must ensure the interrupt is disabled on the card it drives before calling this function. The function does not return until
       any executing interrupts for this IRQ have completed.

       This function must not be called from interrupt context.

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

       Ingo Molnar <mingo@elte.hu>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							       FREE_IRQ(9)