linux-kernel - [PATCH] BUG_ON() bad input to request

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Message-Id: <200801171759.59029.rusty@rustcorp.com.au>
Date:	Thu, 17 Jan 2008 17:59:58 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>
Subject: [PATCH] BUG_ON() bad input to request_irq

Is there any reason why these bugs should be treated gently?  The
caller might not want to check NR_IRQS and IRQ_NOREQUEST cases, but
a NULL handler or NULL dev_id w/ shared are coding bugs.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 kernel/irq/manage.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff -r c2eb8ef5a0be kernel/irq/manage.c
--- a/kernel/irq/manage.c	Thu Jan 17 15:48:03 2008 +1100
+++ b/kernel/irq/manage.c	Thu Jan 17 15:49:33 2008 +1100
@@ -532,13 +532,12 @@ int request_irq(unsigned int irq, irq_ha
 	 * which interrupt is which (messes up the interrupt freeing
 	 * logic etc).
 	 */
-	if ((irqflags & IRQF_SHARED) && !dev_id)
-		return -EINVAL;
+	BUG_ON((irqflags & IRQF_SHARED) && !dev_id);
+	BUG_ON(!handler);
+
 	if (irq >= NR_IRQS)
 		return -EINVAL;
 	if (irq_desc[irq].status & IRQ_NOREQUEST)
-		return -EINVAL;
-	if (!handler)
 		return -EINVAL;
 
 	action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);
--
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