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: Dave Jones <davej@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/dummy-irq.c b/drivers/misc/dummy-irq.c
index 7014167e2c619f23acc05398973552fd8ab23f9e..c37eeedfe215634775a59fa581d83f749a3fb536 100644 (file)
--- a/drivers/misc/dummy-irq.c
+++ b/drivers/misc/dummy-irq.c
@@ -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;