[PATCH] staging: greybus: gpio: add comment describing irq_lock mutex

[UgwuRhema]

Add a description comment for irq_lock to clarify what the mutex
protects and satisfy checkpatch checks.

Signed-off-by: UgwuRhema <hikarialiyev@xxxxxxxxx>
---
 drivers/staging/greybus/gpio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/greybus/gpio.c b/drivers/staging/greybus/gpio.c
index 12185f7a9..7f19b3275 100644
--- a/drivers/staging/greybus/gpio.c
+++ b/drivers/staging/greybus/gpio.c
@@ -39,7 +39,7 @@ struct gb_gpio_controller {
 
 	struct gpio_chip	chip;
 	struct irq_chip		irqc;
-	struct mutex		irq_lock;
+	struct mutex		irq_lock; /* protects IRQ configuration and hardware state */
 };
 
 static struct gpio_chip *irq_data_to_gpio_chip(struct irq_data *d)
-- 
2.55.0