From 25140717414c319bcc44b5aac39357a52d0bc8e0 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Thu, 11 Jan 2018 11:34:46 +0100 Subject: [PATCH 1/4] IIO: ADC: stm32-dfsdm: avoid unused-variable warning Building with CONFIG_OF disabled produces a compiler warning: drivers/iio/adc/stm32-dfsdm-core.c: In function 'stm32_dfsdm_probe': drivers/iio/adc/stm32-dfsdm-core.c:245:22: error: unused variable 'pnode' [-Werror=unused-variable] This removes the variable and open-codes it in the only place it gets used to avoid that warning. Fixes: bed73904e76f ("IIO: ADC: add stm32 DFSDM core support") Signed-off-by: Arnd Bergmann Signed-off-by: Mark Brown --- drivers/iio/adc/stm32-dfsdm-core.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/iio/adc/stm32-dfsdm-core.c b/drivers/iio/adc/stm32-dfsdm-core.c index 72427414db7f1..6cd655f8239b6 100644 --- a/drivers/iio/adc/stm32-dfsdm-core.c +++ b/drivers/iio/adc/stm32-dfsdm-core.c @@ -242,7 +242,6 @@ MODULE_DEVICE_TABLE(of, stm32_dfsdm_of_match); static int stm32_dfsdm_probe(struct platform_device *pdev) { struct dfsdm_priv *priv; - struct device_node *pnode = pdev->dev.of_node; const struct of_device_id *of_id; const struct stm32_dfsdm_dev_data *dev_data; struct stm32_dfsdm *dfsdm; @@ -254,7 +253,7 @@ static int stm32_dfsdm_probe(struct platform_device *pdev) priv->pdev = pdev; - of_id = of_match_node(stm32_dfsdm_of_match, pnode); + of_id = of_match_node(stm32_dfsdm_of_match, pdev->dev.of_node); if (!of_id->data) { dev_err(&pdev->dev, "Data associated to device is missing\n"); return -EINVAL; From d5ff18bcd4b5e66396eab7e8271172157ee1253e Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Thu, 11 Jan 2018 11:12:41 +0000 Subject: [PATCH 2/4] IIO: ADC: fix return value check in stm32_dfsdm_adc_probe() In case of error, the function devm_iio_device_alloc() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. Fixes: e2e6771c6462 ("IIO: ADC: add STM32 DFSDM sigma delta ADC support") Signed-off-by: Wei Yongjun Signed-off-by: Mark Brown --- drivers/iio/adc/stm32-dfsdm-adc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c index e628d04d5c77e..5e871404f565d 100644 --- a/drivers/iio/adc/stm32-dfsdm-adc.c +++ b/drivers/iio/adc/stm32-dfsdm-adc.c @@ -1100,9 +1100,9 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev) dev_data = (const struct stm32_dfsdm_dev_data *)of_id->data; iio = devm_iio_device_alloc(dev, sizeof(*adc)); - if (IS_ERR(iio)) { + if (!iio) { dev_err(dev, "%s: Failed to allocate IIO\n", __func__); - return PTR_ERR(iio); + return -ENOMEM; } adc = iio_priv(iio); From abaca806fd13afd069e04e883de8ec75924b0598 Mon Sep 17 00:00:00 2001 From: Arnaud Pouliquen Date: Mon, 15 Jan 2018 09:57:39 +0100 Subject: [PATCH 3/4] IIO: ADC: stm32-dfsdm: code optimization Use of_device_get_match_data to optimize the source code. No check is needed on dev_data as match table is defined in driver. Signed-off-by: Arnaud Pouliquen Acked-by: Jonathan Cameron Signed-off-by: Mark Brown --- drivers/iio/adc/stm32-dfsdm-adc.c | 9 +-------- drivers/iio/adc/stm32-dfsdm-core.c | 8 +------- 2 files changed, 2 insertions(+), 15 deletions(-) diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c index 5e871404f565d..3fe9b34ac6af8 100644 --- a/drivers/iio/adc/stm32-dfsdm-adc.c +++ b/drivers/iio/adc/stm32-dfsdm-adc.c @@ -1087,18 +1087,11 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev) struct device_node *np = dev->of_node; const struct stm32_dfsdm_dev_data *dev_data; struct iio_dev *iio; - const struct of_device_id *of_id; char *name; int ret, irq, val; - of_id = of_match_node(stm32_dfsdm_adc_match, np); - if (!of_id->data) { - dev_err(&pdev->dev, "Data associated to device is missing\n"); - return -EINVAL; - } - - dev_data = (const struct stm32_dfsdm_dev_data *)of_id->data; + dev_data = of_device_get_match_data(dev); iio = devm_iio_device_alloc(dev, sizeof(*adc)); if (!iio) { dev_err(dev, "%s: Failed to allocate IIO\n", __func__); diff --git a/drivers/iio/adc/stm32-dfsdm-core.c b/drivers/iio/adc/stm32-dfsdm-core.c index 6cd655f8239b6..6290332cfd3f8 100644 --- a/drivers/iio/adc/stm32-dfsdm-core.c +++ b/drivers/iio/adc/stm32-dfsdm-core.c @@ -242,7 +242,6 @@ MODULE_DEVICE_TABLE(of, stm32_dfsdm_of_match); static int stm32_dfsdm_probe(struct platform_device *pdev) { struct dfsdm_priv *priv; - const struct of_device_id *of_id; const struct stm32_dfsdm_dev_data *dev_data; struct stm32_dfsdm *dfsdm; int ret; @@ -253,13 +252,8 @@ static int stm32_dfsdm_probe(struct platform_device *pdev) priv->pdev = pdev; - of_id = of_match_node(stm32_dfsdm_of_match, pdev->dev.of_node); - if (!of_id->data) { - dev_err(&pdev->dev, "Data associated to device is missing\n"); - return -EINVAL; - } + dev_data = of_device_get_match_data(&pdev->dev); - dev_data = (const struct stm32_dfsdm_dev_data *)of_id->data; dfsdm = &priv->dfsdm; dfsdm->fl_list = devm_kcalloc(&pdev->dev, dev_data->num_filters, sizeof(*dfsdm->fl_list), GFP_KERNEL); From 1175d0f9f4031ce02845f6f843f58a9caaee7817 Mon Sep 17 00:00:00 2001 From: Arnaud Pouliquen Date: Mon, 15 Jan 2018 10:00:26 +0100 Subject: [PATCH 4/4] IIO: ADC: stm32-dfsdm: fix static check warning iio_priv does not return an error pointer, so check is not valid. Patch suppresses it. Signed-off-by: Arnaud Pouliquen Acked-by: Jonathan Cameron Signed-off-by: Mark Brown --- drivers/iio/adc/stm32-dfsdm-adc.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c index 3fe9b34ac6af8..daa026d6a94f9 100644 --- a/drivers/iio/adc/stm32-dfsdm-adc.c +++ b/drivers/iio/adc/stm32-dfsdm-adc.c @@ -1099,10 +1099,6 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev) } adc = iio_priv(iio); - if (IS_ERR(adc)) { - dev_err(dev, "%s: Failed to allocate ADC\n", __func__); - return PTR_ERR(adc); - } adc->dfsdm = dev_get_drvdata(dev->parent); iio->dev.parent = dev;