From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Mon, 13 Aug 2018 16:00:27 +0000 (+0300)
Subject: gpiolib: acpi: Switch to cansleep version of GPIO library call
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=993b9bc5c47fda86f8ab4e53d68c6fea5ff2764a;p=openwrt%2Fstaging%2Fblogic.git

gpiolib: acpi: Switch to cansleep version of GPIO library call

The commit ca876c7483b6

  ("gpiolib-acpi: make sure we trigger edge events at least once on boot")

added a initial value check for pin which is about to be locked as IRQ.
Unfortunately, not all GPIO drivers can do that atomically. Thus,
switch to cansleep version of the call. Otherwise we have a warning:

...
  WARNING: CPU: 2 PID: 1408 at drivers/gpio/gpiolib.c:2883 gpiod_get_value+0x46/0x50
...
  RIP: 0010:gpiod_get_value+0x46/0x50
...

The change tested on Intel Broxton with Whiskey Cove PMIC GPIO controller.

Fixes: ca876c7483b6 ("gpiolib-acpi: make sure we trigger edge events at least once on boot")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index c48ed9d89ff5..f9134f23c7e8 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -186,7 +186,7 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
 
 	gpiod_direction_input(desc);
 
-	value = gpiod_get_value(desc);
+	value = gpiod_get_value_cansleep(desc);
 
 	ret = gpiochip_lock_as_irq(chip, pin);
 	if (ret) {