Commit b5eee2fd authored Apr 04, 2011 by Thomas Gleixner Committed by Sascha Hauer Apr 12, 2011

ARM: mxc: Add missing lockdep annotation



The irq_set_wake() function of the gpio irq_chip calls
enable/disable_irq_wake() on the demultiplex interrupt. That leads to
a lockdep warning "INFO: possible recursive locking detected" because
irq_set_type() is called under irq_desc->lock and the *_irq_wake()
calls take irq_desc->lock of the demux interrupt.

Tell lockdep that the gpio irqs are in a different lock class.

Documentation/SubmitChecklist:
 15: All codepaths have been exercised with all lockdep features enabled.

That's a non-optional requirement, AFAICT.

Reported-and-tested-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LAKML-Reference: alpine.LFD.2.00.1104041416290.19945@localhost6.localdomain6
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

parent 0575b4b8

arch/arm/plat-mxc/gpio.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -295,6 +295,12 @@ static int mxc_gpio_direction_output(struct gpio_chip *chip,
		return 0;
		}

		/*
		* This lock class tells lockdep that GPIO irqs are in a different
		* category than their parents, so it won't report false recursion.
		*/
		static struct lock_class_key gpio_lock_class;

		int __init mxc_gpio_init(struct mxc_gpio_port *port, int cnt)
		{
		int i, j;
		@@ -311,6 +317,7 @@ int __init mxc_gpio_init(struct mxc_gpio_port *port, int cnt)
		__raw_writel(~0, port[i].base + GPIO_ISR);
		for (j = port[i].virtual_irq_start;
		j < port[i].virtual_irq_start + 32; j++) {
		irq_set_lockdep_class(j, &gpio_lock_class);
		irq_set_chip_and_handler(j, &gpio_irq_chip,
		handle_level_irq);
		set_irq_flags(j, IRQF_VALID);