kernel/irq: Extend lockdep class for request mutex

The IRQ code already has support for lockdep class for the lock mutex
in an interrupt descriptor. Extend this to add a second class for the
request mutex in the descriptor. Not having a class is resulting in
false positive splats in some code paths.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: linus.walleij@linaro.org
Cc: grygorii.strashko@ti.com
Cc: f.fainelli@gmail.com
Link: https://lkml.kernel.org/r/1512234664-21555-1-git-send-email-andrew@lunn.ch

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpio/gpio-bcm-kona.c b/drivers/gpio/gpio-bcm-kona.c
index dfcf56ee3c61..76861a00bb92 100644
--- a/drivers/gpio/gpio-bcm-kona.c
+++ b/drivers/gpio/gpio-bcm-kona.c
@@ -522,6 +522,7 @@ static struct of_device_id const bcm_kona_gpio_of_match[] = {
  * category than their parents, so it won't report false recursion.
  */
 static struct lock_class_key gpio_lock_class;
+static struct lock_class_key gpio_request_class;
 
 static int bcm_kona_gpio_irq_map(struct irq_domain *d, unsigned int irq,
                                  irq_hw_number_t hwirq)
@@ -531,7 +532,7 @@ static int bcm_kona_gpio_irq_map(struct irq_domain *d, unsigned int irq,
         ret = irq_set_chip_data(irq, d->host_data);
         if (ret < 0)
                 return ret;
-        irq_set_lockdep_class(irq, &gpio_lock_class);
+        irq_set_lockdep_class(irq, &gpio_lock_class, &gpio_request_class);
         irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip, handle_simple_irq);
         irq_set_noprobe(irq);