[PATCH v6 4/7] gpiolib: emit a debug message when adding events to a full kfifo

Bartosz Golaszewski
2020-01-24T17:27:37Z

Currently if the line-event kfifo is full, we just silently drop any new
events. Add a ratelimited debug message so that we at least have some
trace in the kernel log of event overflow.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/gpio/gpiolib.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 66df06a24cfd..4ce34958e335 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -978,6 +978,8 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p)
1, &le->wait.lock);
if (ret)
wake_up_poll(&le->wait, EPOLLIN);
+ else
+ pr_debug_ratelimited("event FIFO is full - event dropped\n");

return IRQ_HANDLED;
}
--
2.23.0