linux-kernel - [PATCH] gpio / ACPI: fix returned error from acpi_dev_gpio_irq

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Date:   Wed, 12 Oct 2016 18:40:30 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Mika Westerberg <mika.westerberg@...el.com>
Cc:     David Arcari <darcari@...hat.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] gpio / ACPI: fix returned error from acpi_dev_gpio_irq_get()

From: David Arcari <darcari@...hat.com>

acpi_dev_gpio_irq_get() currently ignores the error returned
by acpi_get_gpiod_by_index() and overwrites it with -ENOENT.

Problem is this error can be -EPROBE_DEFER, which just blows
up some drivers when the module ordering is not correct.

Cc: stable@...r.kernel.org
Signed-off-by: David Arcari <darcari@...hat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---

Hi David,

I am planning on sending this to the list, any last minute comments?

Cheers,
Benjamin

 drivers/gpio/gpiolib-acpi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 9e48e69..f963a12 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -613,14 +613,17 @@ int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 {
 	int idx, i;
 	unsigned int irq_flags;
+	int ret = -ENOENT;
 
 	for (i = 0, idx = 0; idx <= index; i++) {
 		struct acpi_gpio_info info;
 		struct gpio_desc *desc;
 
 		desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
-		if (IS_ERR(desc))
+		if (IS_ERR(desc)) {
+			ret = PTR_ERR(desc);
 			break;
+		}
 		if (info.gpioint && idx++ == index) {
 			int irq = gpiod_to_irq(desc);
 
@@ -639,7 +642,7 @@ int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 		}
 
 	}
-	return -ENOENT;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
 
-- 
2.7.4