linux-kernel - [PATCH AUTOSEL for 4.14 002/135] HID: cp2112: fix broken gpio_direction

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Date:   Thu, 7 Dec 2017 15:45:30 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Sébastien Szymanski 
        <sebastien.szymanski@...adeus.com>, Jiri Kosina <jkosina@...e.cz>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 002/135] HID: cp2112: fix broken
 gpio_direction_input callback

From: Sébastien Szymanski <sebastien.szymanski@...adeus.com>

[ Upstream commit 7da85fbf1c87d4f73621e0e7666a3387497075a9 ]

When everything goes smoothly, ret is set to 0 which makes the function
to return EIO error.

Fixes: 8e9faa15469e ("HID: cp2112: fix gpio-callback error handling")
Signed-off-by: Sébastien Szymanski <sebastien.szymanski@...adeus.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/hid/hid-cp2112.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-cp2112.c b/drivers/hid/hid-cp2112.c
index 078026f63b6f..4e940a096b2a 100644
--- a/drivers/hid/hid-cp2112.c
+++ b/drivers/hid/hid-cp2112.c
@@ -196,6 +196,8 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 				 HID_REQ_GET_REPORT);
 	if (ret != CP2112_GPIO_CONFIG_LENGTH) {
 		hid_err(hdev, "error requesting GPIO config: %d\n", ret);
+		if (ret >= 0)
+			ret = -EIO;
 		goto exit;
 	}
 
@@ -205,8 +207,10 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 	ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
 				 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
 				 HID_REQ_SET_REPORT);
-	if (ret < 0) {
+	if (ret != CP2112_GPIO_CONFIG_LENGTH) {
 		hid_err(hdev, "error setting GPIO config: %d\n", ret);
+		if (ret >= 0)
+			ret = -EIO;
 		goto exit;
 	}
 
@@ -214,7 +218,7 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 
 exit:
 	mutex_unlock(&dev->lock);
-	return ret < 0 ? ret : -EIO;
+	return ret;
 }
 
 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-- 
2.11.0