linux-kernel - [PATCH] Input: adc-joystick - fix ordering in adc_joystick

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Date:   Fri, 8 Jul 2022 21:35:19 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Artur Rojek <contact@...ur-rojek.eu>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH] Input: adc-joystick - fix ordering in adc_joystick_probe()

We should register the IIO buffer before we register the input device,
because as soon as the device is registered input handlers may attach to
it, resulting in a call to adc_joystick_open() which makes use of the said
buffer.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---

Not tested on hardware...

 drivers/input/joystick/adc-joystick.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/input/joystick/adc-joystick.c b/drivers/input/joystick/adc-joystick.c
index 78ebca7d400a..e0cfdc84763f 100644
--- a/drivers/input/joystick/adc-joystick.c
+++ b/drivers/input/joystick/adc-joystick.c
@@ -222,13 +222,6 @@ static int adc_joystick_probe(struct platform_device *pdev)
 	if (error)
 		return error;
 
-	input_set_drvdata(input, joy);
-	error = input_register_device(input);
-	if (error) {
-		dev_err(dev, "Unable to register input device\n");
-		return error;
-	}
-
 	joy->buffer = iio_channel_get_all_cb(dev, adc_joystick_handle, joy);
 	if (IS_ERR(joy->buffer)) {
 		dev_err(dev, "Unable to allocate callback buffer\n");
@@ -241,6 +234,14 @@ static int adc_joystick_probe(struct platform_device *pdev)
 		return error;
 	}
 
+	input_set_drvdata(input, joy);
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(dev, "Unable to register input device\n");
+		return error;
+	}
+
 	return 0;
 }
 
-- 
2.37.0.144.g8ac04bfd2-goog


-- 
Dmitry