linux-kernel - [PATCH 2/3] Input - soc_button_array: bail out earlier if gpiod

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Date:	Tue, 10 May 2016 17:37:52 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bastien Nocera <hadess@...ess.net>,
	Alexandre Courbot <acourbot@...dia.com>,
	Lejun Zhu <lejun.zhu@...ux.intel.com>
Subject: [PATCH 2/3] Input - soc_button_array: bail out earlier if gpiod_count is null

The PNP0C40 device of the Surface 3 doesn't have any GPIO attached to it.
Instead of trying to access the GPIO, request the count beforehand and
bail out if it is null or if an error is returned.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---
 drivers/input/misc/soc_button_array.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
index 9cbe874..70002a3 100644
--- a/drivers/input/misc/soc_button_array.c
+++ b/drivers/input/misc/soc_button_array.c
@@ -165,6 +165,11 @@ static int soc_button_probe(struct platform_device *pdev)
 	if (!id)
 		return -ENODEV;
 
+	if (gpiod_count(&pdev->dev, KBUILD_MODNAME) <= 0) {
+		dev_info(&pdev->dev, "no GPIO attached, ignoring...\n");
+		return -ENODEV;
+	}
+
 	button_info = (struct soc_button_info *)id->driver_data;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-- 
2.5.0