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From: Bartosz Golaszewski <brgl@bgdev.pl>
To: Kent Gibson <warthog618@gmail.com>,
	Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>
Subject: [PATCH v2 08/11] gpiolib: emit a debug message when adding events to a full kfifo
Date: Wed,  4 Dec 2019 16:59:11 +0100
Message-ID: <20191204155912.17590-9-brgl@bgdev.pl> (raw)
In-Reply-To: <20191204155912.17590-1-brgl@bgdev.pl>

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


  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04 15:59 [PATCH v2 00/11] gpiolib: add an ioctl() for monitoring line status changes Bartosz Golaszewski
2019-12-04 15:59 ` [PATCH v2 01/11] gpiolib: use 'unsigned int' instead of 'unsigned' in gpio_set_config() Bartosz Golaszewski
2019-12-04 22:18   ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 02/11] gpiolib: have a single place of calling set_config() Bartosz Golaszewski
2019-12-04 22:18   ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 03/11] gpiolib: convert the type of hwnum to unsigned int in gpiochip_get_desc() Bartosz Golaszewski
2019-12-04 22:19   ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 04/11] gpiolib: use gpiochip_get_desc() in linehandle_create() Bartosz Golaszewski
2019-12-04 22:20   ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 05/11] gpiolib: use gpiochip_get_desc() in lineevent_create() Bartosz Golaszewski
2019-12-04 22:20   ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 06/11] gpiolib: use gpiochip_get_desc() in gpio_ioctl() Bartosz Golaszewski
2019-12-04 16:25   ` Rainer Sickinger
2019-12-04 22:21   ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 07/11] gpiolib: rework the locking mechanism for lineevent kfifo Bartosz Golaszewski
2019-12-04 22:25   ` Andy Shevchenko
2019-12-05  9:31     ` Bartosz Golaszewski
2019-12-05 10:22       ` Andy Shevchenko
2019-12-04 15:59 ` Bartosz Golaszewski [this message]
2019-12-04 22:28   ` [PATCH v2 08/11] gpiolib: emit a debug message when adding events to a full kfifo Andy Shevchenko
2019-12-19 16:22     ` Bartosz Golaszewski
2019-12-04 15:59 ` [PATCH v2 09/11] gpiolib: provide a dedicated function for setting lineinfo Bartosz Golaszewski
2019-12-04 22:30   ` Andy Shevchenko
2019-12-05  9:28     ` Bartosz Golaszewski
2019-12-05 10:20       ` Andy Shevchenko
2019-12-05 13:45         ` Bartosz Golaszewski
2019-12-05 16:47           ` Andy Shevchenko

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