Re: [PATCH] can: sja1000: fix compilation on x86

On 12/14/2012 10:37 PM, David Miller wrote:

From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Fri, 14 Dec 2012 22:33:44 +0100

quoted

@@ -121,7 +121,7 @@ static int sja1000_ofp_probe(struct platform_device *ofdev)
 	}
 
 	irq = irq_of_parse_and_map(np, 0);
-	if (irq == NO_IRQ) {
+	if (irq <= 0) {
 		dev_err(&ofdev->dev, "no irq found\n");
 		err = -ENODEV;
 		goto exit_unmap_mem;

I don't see anything existing which says this is the proper
transformation.

There is no consistency at all for the tests of the return
value of irq_of_parse_and_map().

Right. And the current status of NO_IRQ doesn't help much.

And if anything testing against zero is the correct thing to
do, universally.

I've looked at the implementation of irq_of_parse_and_map() (both the
generic and sparc one), they both return 0 on failure. Because there are
some arch that define NO_IRQ being not 0, sparc (0xffffffff) and arm
(-1), I though testing against <= 0 would be a good idea.

I'm not applying this or pulling from your tree, sorry.

Marc

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