linux-kernel - [PATCH v2 05/19] staging: iio: resolver: ad2s1210: fix probe

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Date:   Thu, 21 Sep 2023 09:43:46 -0500
From:   David Lechner <dlechner@...libre.com>
To:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-staging@...ts.linux.dev
Cc:     linux-kernel@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Axel Haslam <ahaslam@...libre.com>,
        Philip Molloy <pmolloy@...libre.com>,
        David Lechner <dlechner@...libre.com>
Subject: [PATCH v2 05/19] staging: iio: resolver: ad2s1210: fix probe

This fixes a number of issues in the ad2s1210_probe() function:
- Move call to ad2s1210_setup_gpios() after `st->sdev = spi;`. This
  fixes use of this pointer before it is initialized.
- Check return value on ad2s1210_initial().
- Move devm_iio_device_register() to the end to avoid race of
  registering before fully initialized.
- Remove call to spi_setup(). Note: MODE_3 was incorrect, it should be
  MODE_1 but we can let the device tree select this.
- Change default value for fclkin. This is an external oscillator, not
  the SPI bus clock. (Will use device tree to get the correct value
  in a future patch. For now, using the eval board value.)
- Remove spi_set_drvdata().

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/staging/iio/resolver/ad2s1210.c | 30 ++++++++++++-------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
index 0bdd5a30d45d..9c7f76114360 100644
--- a/drivers/staging/iio/resolver/ad2s1210.c
+++ b/drivers/staging/iio/resolver/ad2s1210.c
@@ -3,6 +3,7 @@
  * ad2s1210.c support for the ADI Resolver to Digital Converters: AD2S1210
  *
  * Copyright (c) 2010-2010 Analog Devices Inc.
+ * Copyright (C) 2023 BayLibre, SAS
  */
 #include <linux/types.h>
 #include <linux/mutex.h>
@@ -657,12 +658,8 @@ static int ad2s1210_probe(struct spi_device *spi)
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (!indio_dev)
 		return -ENOMEM;
-	st = iio_priv(indio_dev);
-	ret = ad2s1210_setup_gpios(st);
-	if (ret < 0)
-		return ret;
 
-	spi_set_drvdata(spi, indio_dev);
+	st = iio_priv(indio_dev);
 
 	mutex_init(&st->lock);
 	st->sdev = spi;
@@ -671,22 +668,25 @@ static int ad2s1210_probe(struct spi_device *spi)
 	st->resolution = 12;
 	st->fexcit = AD2S1210_DEF_EXCIT;
 
+	ret = ad2s1210_setup_clocks(st);
+	if (ret < 0)
+		return ret;
+
+	ret = ad2s1210_setup_gpios(st);
+	if (ret < 0)
+		return ret;
+
+	ret = ad2s1210_initial(st);
+	if (ret < 0)
+		return ret;
+
 	indio_dev->info = &ad2s1210_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = ad2s1210_channels;
 	indio_dev->num_channels = ARRAY_SIZE(ad2s1210_channels);
 	indio_dev->name = spi_get_device_id(spi)->name;
 
-	ret = devm_iio_device_register(&spi->dev, indio_dev);
-	if (ret)
-		return ret;
-
-	st->fclkin = spi->max_speed_hz;
-	spi->mode = SPI_MODE_3;
-	spi_setup(spi);
-	ad2s1210_initial(st);
-
-	return 0;
+	return devm_iio_device_register(&spi->dev, indio_dev);
 }
 
 static const struct of_device_id ad2s1210_of_match[] = {
-- 
2.34.1