[PATCH v4 10/13] gpiolib: emit a debug message when adding events to a full kfifo

Bartosz Golaszewski
2019-12-24T12:07:51Z

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

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 a859c0813e0d..543244355e1c 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -979,6 +979,8 @@ 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