linux-kernel - Re: [WARNING] local_bh_enable with irqs disabled:

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Date:	Tue, 10 Jun 2008 17:15:52 -0700
From:	David Brownell <david-b@...bell.net>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [WARNING] local_bh_enable with irqs disabled:

On Thursday 05 June 2008, Guennadi Liakhovetski wrote:
> Sorry, this was a 2.6.26-rc3 based kernel with the gpio-sysfs patch from 
> David, e.g., http://marc.info/?l=linux-kernel&m=121107105300923&w=2,
> which introduces a call to device_unregister via gpiochip_unexport(chip); 
> in gpiochip_remove. 

Right.  Obviously that wasn't tested with "rmmod" of a modular
GPIO expander ... I only have one board which supports such an
expander right now, and it's not been in use recently.

A fix is obvious; any problems with what's below?

- Dave


--- g26.orig/drivers/gpio/gpiolib.c	2008-06-10 16:56:01.000000000 -0700
+++ g26/drivers/gpio/gpiolib.c	2008-06-10 16:55:39.000000000 -0700
@@ -726,12 +726,15 @@ int gpiochip_remove(struct gpio_chip *ch
 		}
 	}
 	if (status == 0) {
-		gpiochip_unexport(chip);
 		for (id = chip->base; id < chip->base + chip->ngpio; id++)
 			gpio_desc[id].chip = NULL;
 	}
 
 	spin_unlock_irqrestore(&gpio_lock, flags);
+
+	if (status == 0)
+		gpiochip_unexport(chip);
+
 	return status;
 }
 EXPORT_SYMBOL_GPL(gpiochip_remove);

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