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Input: soc_button_array - bail out earlier if gpiod_count is zero 

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@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Benjamin Tissoires 2016-11-25 11:36:01 -08:00 committed by Dmitry Torokhov
parent be8e7a7ec8
commit 3d5a9437a6
1 changed files with 5 additions and 0 deletions
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5
drivers/input/misc/soc_button_array.c
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@ -167,6 +167,11 @@ static int soc_button_probe(struct platform_device *pdev)
button_info = (struct soc_button_info *)id->driver_data;
if (gpiod_count(&pdev->dev, KBUILD_MODNAME) <= 0) {
dev_dbg(&pdev->dev, "no GPIO attached, ignoring...\n");
return -ENODEV;
}
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;