suse man page for enable_irq

ENABLE_IRQ(9)							Hardware Interfaces						     ENABLE_IRQ(9)

NAME
       enable_irq - enable handling of an irq

SYNOPSIS
       void enable_irq(unsigned int irq);

ARGUMENTS
       irq
	   Interrupt to enable

DESCRIPTION
       Undoes the effect of one call to disable_irq. If this matches the last disable, processing of interrupts on this IRQ line is re-enabled.

       This function may be called from IRQ context only when desc->chip->bus_lock and desc->chip->bus_sync_unlock are NULL !

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							     ENABLE_IRQ(9)