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Commit a7b594b4 authored by Jonathan Corbet's avatar Jonathan Corbet Committed by Greg Kroah-Hartman
Browse files

dummy-irq: require the user to specify an IRQ number 



Make sure that we let the user know that without specifying IRQ#,
dummy-irq driver is useless.

Reported-by: default avatarDave Jones <davej@redhat.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f722406f

drivers/misc/dummy-irq.c

+5 −1
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ 
#include <linux/irq.h>

#include <linux/interrupt.h>



static int irq;

static int irq = -1;



static irqreturn_t dummy_interrupt(int irq, void *dev_id)

{
@@ -36,6 +36,10 @@ static irqreturn_t dummy_interrupt(int irq, void *dev_id) 


static int __init dummy_irq_init(void)

{

	if (irq < 0) {

		printk(KERN_ERR "dummy-irq: no IRQ given.  Use irq=N\n");

		return -EIO;

	}

	if (request_irq(irq, &dummy_interrupt, IRQF_SHARED, "dummy_irq", &irq)) {

		printk(KERN_ERR "dummy-irq: cannot register IRQ %d\n", irq);

		return -EIO;