.TH "free_irq" 9 "free_irq" "25 May 1998" "Kernel Hacker's Manual" LINUX
.SH NAME
free_irq \-  free an interrupt
.SH SYNOPSIS
.B "void" free_irq
.BI "(unsigned int " irq ","
.BI "void *" dev_id ");"
.SH ARGUMENTS
.IP "irq" 12
 Interrupt line to free
.IP "dev_id" 12
 Device identity to free
.SH "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 may be called from interrupt context. 
.SH "BUGS"
 Attempting to free an irq in a handler for the same irq hangs
the machine.