[v5,4/7] gpiolib: emit a debug message when adding events to a full kfifo
diff mbox series

Message ID 20200109115010.27814-5-brgl@bgdev.pl
State New
Headers show
Series
  • gpiolib: add an ioctl() for monitoring line status changes
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Commit Message

Bartosz Golaszewski Jan. 9, 2020, 11:50 a.m. UTC
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(+)

Patch
diff mbox series

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 43c96e7cdc48..6b5d102dfb13 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -987,6 +987,8 @@  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;
 }