Re: dummy irq trace 'Flags mismatch'

From: Jonathan Corbet
Date: Tue Apr 30 2013 - 10:00:20 EST

On Tue, 30 Apr 2013 06:59:22 +0200 (CEST)
Jiri Kosina <jkosina@xxxxxxx> wrote:

> Or have it depend on CONFIG_EXPERT would probably make most sense ... ?

We could also just have it tell you when you screwed up? Something like
the following (compile tested only)?

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

Reported-by: Dave Jones <davej@xxxxxxxxxx>
Signed-off-by: Jonathan Corbet <corbet@xxxxxxx>

diff --git a/drivers/misc/dummy-irq.c b/drivers/misc/dummy-irq.c
index 7014167..c37eeed 100644
--- 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;
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