'\" t
.\"     Title: irq_disable
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Internal Functions Provided
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "IRQ_DISABLE" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Internal Functions Provided"
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.SH "NAME"
irq_disable \- Mark interrupt disabled
.SH "SYNOPSIS"
.HP \w'void\ irq_disable('u
.BI "void irq_disable(struct\ irq_desc\ *\ " "desc" ");"
.SH "ARGUMENTS"
.PP
\fIdesc\fR
.RS 4
irq descriptor which should be disabled
.RE
.SH "DESCRIPTION"
.PP
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\*(Aqs 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\&.
.PP
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 \*(Aqirq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)\*(Aq\&. 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\&.
.SH "AUTHORS"
.PP
\fBThomas Gleixner\fR <\&tglx@linutronix.de\&>
.RS 4
Author.
.RE
.PP
\fBIngo Molnar\fR <\&mingo@elte.hu\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br