linux-kernel - [PATCH v2 05/12] gpio: acpi: Synchronize acpi_find_gpio() and acpi_gpio

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Message-Id: <20170523170327.18055-6-andriy.shevchenko@linux.intel.com>
Date:   Tue, 23 May 2017 20:03:20 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-acpi@...r.kernel.org,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Jagadish Krishnamoorthy <jagadish.krishnamoorthy@...el.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 05/12] gpio: acpi: Synchronize acpi_find_gpio() and acpi_gpio_count()

If we pass connection ID to the both functions and at the same time
acpi_can_fallback_to_crs() returns false we will get different results,
i.e. the number of GPIO resources returned by acpi_gpio_count() might be
not correct.

Fix this by calling acpi_can_fallback_to_crs() in acpi_gpio_count()
before trying to fallback.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/gpio/gpiolib-acpi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 0392d8ed332f..740df0e9dcb3 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -1119,6 +1119,9 @@ int acpi_gpio_count(struct device *dev, const char *con_id)
 		struct list_head resource_list;
 		unsigned int crs_count = 0;
 
+		if (!acpi_can_fallback_to_crs(adev, con_id))
+			return count;
+
 		INIT_LIST_HEAD(&resource_list);
 		acpi_dev_get_resources(adev, &resource_list,
 				       acpi_find_gpio_count, &crs_count);
-- 
2.11.0