From 3925ff0fcba71a27be14b19b01c0b67efbab0be9 Mon Sep 17 00:00:00 2001 From: Eva Rachel Retuya Date: Tue, 1 Nov 2016 01:04:31 +0800 Subject: [PATCH] staging: iio: rework regulator handling Currently, the affected drivers ignore all errors from regulator_get(). The way it is now, it also breaks probe deferral (EPROBE_DEFER). The correct behavior is to propagate the error to the upper layers so they can handle it accordingly. Rework the regulator handling so that it matches the standard behavior. If the specific design uses a static always-on regulator and does not explicitly specify it, regulator_get() will return the dummy regulator. The following semantic patch was used to apply the change: @r1@ expression reg, dev, en, volt; @@ reg = \(devm_regulator_get\|regulator_get\)(dev, ...); if ( - ! IS_ERR(reg)) + return PTR_ERR(reg); ( - { en = regulator_enable(reg); - if (en) return en; } + + en = regulator_enable(reg); + if (en) { + dev_err(dev, "Failed to enable specified supply\n"); + return en; } | + - { en = regulator_enable(reg); - if (en) return en; - volt = regulator_get_voltage(reg); } + en = regulator_enable(reg); + if (en) { + dev_err(dev, "Failed to enable specified supply\n"); + return en; + } + volt = regulator_get_voltage(reg); ) @r2@ expression arg; @@ - if (!IS_ERR(arg)) regulator_disable(arg); + regulator_disable(arg); Hand-edit the debugging prints with the supply name to become more specific. Suggested-by: Lars-Peter Clausen Signed-off-by: Eva Rachel Retuya Signed-off-by: Jonathan Cameron --- drivers/staging/iio/adc/ad7192.c | 18 +++++++++--------- drivers/staging/iio/adc/ad7780.c | 18 +++++++++--------- drivers/staging/iio/frequency/ad9832.c | 17 +++++++++-------- drivers/staging/iio/frequency/ad9834.c | 17 +++++++++-------- .../staging/iio/impedance-analyzer/ad5933.c | 19 ++++++++++--------- 5 files changed, 46 insertions(+), 43 deletions(-) diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c index 41fb32de5992ba..29e32b71f0f7d2 100644 --- a/drivers/staging/iio/adc/ad7192.c +++ b/drivers/staging/iio/adc/ad7192.c @@ -634,13 +634,15 @@ static int ad7192_probe(struct spi_device *spi) st = iio_priv(indio_dev); st->reg = devm_regulator_get(&spi->dev, "avdd"); - if (!IS_ERR(st->reg)) { - ret = regulator_enable(st->reg); - if (ret) - return ret; + if (IS_ERR(st->reg)) + return PTR_ERR(st->reg); - voltage_uv = regulator_get_voltage(st->reg); + ret = regulator_enable(st->reg); + if (ret) { + dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); + return ret; } + voltage_uv = regulator_get_voltage(st->reg); if (pdata->vref_mv) st->int_vref_mv = pdata->vref_mv; @@ -689,8 +691,7 @@ static int ad7192_probe(struct spi_device *spi) error_remove_trigger: ad_sd_cleanup_buffer_and_trigger(indio_dev); error_disable_reg: - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); + regulator_disable(st->reg); return ret; } @@ -703,8 +704,7 @@ static int ad7192_remove(struct spi_device *spi) iio_device_unregister(indio_dev); ad_sd_cleanup_buffer_and_trigger(indio_dev); - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); + regulator_disable(st->reg); return 0; } diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c index a88236e74cdbff..e14960038d3e79 100644 --- a/drivers/staging/iio/adc/ad7780.c +++ b/drivers/staging/iio/adc/ad7780.c @@ -174,13 +174,15 @@ static int ad7780_probe(struct spi_device *spi) ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info); st->reg = devm_regulator_get(&spi->dev, "avdd"); - if (!IS_ERR(st->reg)) { - ret = regulator_enable(st->reg); - if (ret) - return ret; + if (IS_ERR(st->reg)) + return PTR_ERR(st->reg); - voltage_uv = regulator_get_voltage(st->reg); + ret = regulator_enable(st->reg); + if (ret) { + dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); + return ret; } + voltage_uv = regulator_get_voltage(st->reg); st->chip_info = &ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data]; @@ -222,8 +224,7 @@ static int ad7780_probe(struct spi_device *spi) error_cleanup_buffer_and_trigger: ad_sd_cleanup_buffer_and_trigger(indio_dev); error_disable_reg: - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); + regulator_disable(st->reg); return ret; } @@ -236,8 +237,7 @@ static int ad7780_remove(struct spi_device *spi) iio_device_unregister(indio_dev); ad_sd_cleanup_buffer_and_trigger(indio_dev); - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); + regulator_disable(st->reg); return 0; } diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c index 744c8ee9c5a6b7..7d8dc6cab72019 100644 --- a/drivers/staging/iio/frequency/ad9832.c +++ b/drivers/staging/iio/frequency/ad9832.c @@ -213,10 +213,13 @@ static int ad9832_probe(struct spi_device *spi) } reg = devm_regulator_get(&spi->dev, "avdd"); - if (!IS_ERR(reg)) { - ret = regulator_enable(reg); - if (ret) - return ret; + if (IS_ERR(reg)) + return PTR_ERR(reg); + + ret = regulator_enable(reg); + if (ret) { + dev_err(&spi->dev, "Failed to enable specified AVDD supply\n"); + return ret; } indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); @@ -311,8 +314,7 @@ static int ad9832_probe(struct spi_device *spi) return 0; error_disable_reg: - if (!IS_ERR(reg)) - regulator_disable(reg); + regulator_disable(reg); return ret; } @@ -323,8 +325,7 @@ static int ad9832_remove(struct spi_device *spi) struct ad9832_state *st = iio_priv(indio_dev); iio_device_unregister(indio_dev); - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); + regulator_disable(st->reg); return 0; } diff --git a/drivers/staging/iio/frequency/ad9834.c b/drivers/staging/iio/frequency/ad9834.c index ca3cea68d8d7c2..19216af1dfc92e 100644 --- a/drivers/staging/iio/frequency/ad9834.c +++ b/drivers/staging/iio/frequency/ad9834.c @@ -330,10 +330,13 @@ static int ad9834_probe(struct spi_device *spi) } reg = devm_regulator_get(&spi->dev, "avdd"); - if (!IS_ERR(reg)) { - ret = regulator_enable(reg); - if (ret) - return ret; + if (IS_ERR(reg)) + return PTR_ERR(reg); + + ret = regulator_enable(reg); + if (ret) { + dev_err(&spi->dev, "Failed to enable specified AVDD supply\n"); + return ret; } indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); @@ -416,8 +419,7 @@ static int ad9834_probe(struct spi_device *spi) return 0; error_disable_reg: - if (!IS_ERR(reg)) - regulator_disable(reg); + regulator_disable(reg); return ret; } @@ -428,8 +430,7 @@ static int ad9834_remove(struct spi_device *spi) struct ad9834_state *st = iio_priv(indio_dev); iio_device_unregister(indio_dev); - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); + regulator_disable(st->reg); return 0; } diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c index 62f61bcc0003e1..8f2736a0f85440 100644 --- a/drivers/staging/iio/impedance-analyzer/ad5933.c +++ b/drivers/staging/iio/impedance-analyzer/ad5933.c @@ -724,12 +724,15 @@ static int ad5933_probe(struct i2c_client *client, pdata = &ad5933_default_pdata; st->reg = devm_regulator_get(&client->dev, "vdd"); - if (!IS_ERR(st->reg)) { - ret = regulator_enable(st->reg); - if (ret) - return ret; - voltage_uv = regulator_get_voltage(st->reg); + if (IS_ERR(st->reg)) + return PTR_ERR(st->reg); + + ret = regulator_enable(st->reg); + if (ret) { + dev_err(&client->dev, "Failed to enable specified VDD supply\n"); + return ret; } + voltage_uv = regulator_get_voltage(st->reg); if (voltage_uv) st->vref_mv = voltage_uv / 1000; @@ -772,8 +775,7 @@ static int ad5933_probe(struct i2c_client *client, error_unreg_ring: iio_kfifo_free(indio_dev->buffer); error_disable_reg: - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); + regulator_disable(st->reg); return ret; } @@ -785,8 +787,7 @@ static int ad5933_remove(struct i2c_client *client) iio_device_unregister(indio_dev); iio_kfifo_free(indio_dev->buffer); - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); + regulator_disable(st->reg); return 0; }