From 914ae25a62e77ebbfa0ce7cbc60edd01cc4d1d31 Mon Sep 17 00:00:00 2001 From: Lothar Waßmann Date: Tue, 9 Sep 2014 00:40:32 -0700 Subject: leds: trigger: gpio: fix warning in gpio trigger for gpios whose accessor function may sleep MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When using a GPIO driver whose accessor functions may sleep (e.g. an I2C GPIO extender like PCA9554) the following warning is issued: WARNING: CPU: 0 PID: 665 at drivers/gpio/gpiolib.c:2274 gpiod_get_raw_value+0x3c/0x48() Modules linked in: CPU: 0 PID: 665 Comm: kworker/0:2 Not tainted 3.16.0-karo+ #115 Workqueue: events gpio_trig_work [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (warn_slowpath_common+0x64/0x84) [] (warn_slowpath_common) from [] (warn_slowpath_null+0x1c/0x24) [] (warn_slowpath_null) from [] (gpiod_get_raw_value+0x3c/0x48) [] (gpiod_get_raw_value) from [] (gpio_trig_work+0x1c/0xb0) [] (gpio_trig_work) from [] (process_one_work+0x144/0x38c) [] (process_one_work) from [] (worker_thread+0x60/0x5cc) [] (worker_thread) from [] (kthread+0xb4/0xd0) [] (kthread) from [] (ret_from_fork+0x14/0x24) ---[ end trace cd51a1dad8b86c9c ]--- Fix this by using the _cansleep() variant of gpio_get_value(). Signed-off-by: Lothar Waßmann Signed-off-by: Bryan Wu --- drivers/leds/trigger/ledtrig-gpio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/leds/trigger') diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c index 35812e3a37f2..c86c41826476 100644 --- a/drivers/leds/trigger/ledtrig-gpio.c +++ b/drivers/leds/trigger/ledtrig-gpio.c @@ -48,7 +48,7 @@ static void gpio_trig_work(struct work_struct *work) if (!gpio_data->gpio) return; - tmp = gpio_get_value(gpio_data->gpio); + tmp = gpio_get_value_cansleep(gpio_data->gpio); if (gpio_data->inverted) tmp = !tmp; -- cgit v1.2.3-59-g8ed1b