linux-kernel - Re: dummy irq trace 'Flags mismatch'

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Message-ID: <20130430072817.61d3ca9f@lwn.net>
Date:	Tue, 30 Apr 2013 07:28:17 -0600
From:	Jonathan Corbet <corbet@....net>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: dummy irq trace 'Flags mismatch'

On Tue, 30 Apr 2013 06:59:22 +0200 (CEST)
Jiri Kosina <jkosina@...e.cz> 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)?

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

Reported-by: Dave Jones <davej@...hat.com>
Signed-off-by: Jonathan Corbet <corbet@....net>

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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