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Subject[PATCH v2 08/11] gpiolib: emit a debug message when adding events to a full kfifo
Date
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 | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 43f90eca6d45..c89d297da270 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -975,6 +975,9 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p)
ret = kfifo_in_spinlocked(&le->events, &ge, 1, &le->wait.lock);
if (ret)
wake_up_poll(&le->wait, EPOLLIN);
+ else
+ pr_debug_ratelimited(
+ "%s: event FIFO is full - event dropped\n", __func__);

return IRQ_HANDLED;
}
--
2.23.0
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