[PATCH] pinctrl: bcm2835: Clear the event latch register when disabling interrupts

[Jonathan Bell]

It's possible to hit a race condition if interrupts are generated on a GPIO
pin when the IRQ line in question is being disabled.

If the interrupt is freed, bcm2835_gpio_irq_disable() is called which
disables the event generation sources (edge, level). If an event occurred
between the last disabling of hard IRQs and the write to the event
source registers, a bit would be set in the GPIO event detect register
(GPEDSn) which goes unacknowledged by bcm2835_gpio_irq_handler()
so Linux complains loudly.

There is no per-GPIO mask register, so when disabling GPIO interrupts
write 1 to the relevant bit in GPEDSn to clear out any stale events.

Signed-off-by: Jonathan Bell <jonathan at raspberrypi.org>

---
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index efcf2a2..547b925 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -473,6 +473,8 @@ static void bcm2835_gpio_irq_disable(struct irq_data *data)
 
     spin_lock_irqsave(&pc->irq_lock[bank], flags);
     bcm2835_gpio_irq_config(pc, gpio, false);
+    /* Clear events that were latched prior to clearing event sources */
+    bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
     clear_bit(offset, &pc->enabled_irq_map[bank]);
     spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
 }
-- 
1.8.1.2