From b5eee2fdefc89df312034e5e0e6f5dd55c4e9bae Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 4 Apr 2011 14:29:58 +0200 Subject: [PATCH] ARM: mxc: Add missing lockdep annotation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Thomas Gleixner LAKML-Reference: alpine.LFD.2.00.1104041416290.19945@localhost6.localdomain6 Signed-off-by: Uwe Kleine-König Signed-off-by: Sascha Hauer --- arch/arm/plat-mxc/gpio.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c index 7a107246fd98..6cd6d7f686f6 100644 --- a/arch/arm/plat-mxc/gpio.c +++ b/arch/arm/plat-mxc/gpio.c @@ -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);