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Date: Tue, 26 May 2020 20:53:51 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Fabrice Gasnier <fabrice.gasnier@...com>, Stable@...r.kernel.org, Jonathan Cameron <Jonathan.Cameron@...wei.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.19 76/81] iio: adc: stm32-adc: fix device used to request dma From: Fabrice Gasnier <fabrice.gasnier@...com> [ Upstream commit 52cd91c27f3908b88e8b25aed4a4d20660abcc45 ] DMA channel request should use device struct from platform device struct. Currently it's using iio device struct. But at this stage when probing, device struct isn't yet registered (e.g. device_register is done in iio_device_register). Since commit 71723a96b8b1 ("dmaengine: Create symlinks between DMA channels and slaves"), a warning message is printed as the links in sysfs can't be created, due to device isn't yet registered: - Cannot create DMA slave symlink - Cannot create DMA dma:rx symlink Fix this by using device struct from platform device to request dma chan. Fixes: 2763ea0585c99 ("iio: adc: stm32: add optional dma support") Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com> Cc: <Stable@...r.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/iio/adc/stm32-adc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index d85caedda02e..59fd8b620c50 100644 --- a/drivers/iio/adc/stm32-adc.c +++ b/drivers/iio/adc/stm32-adc.c @@ -1682,18 +1682,18 @@ static int stm32_adc_chan_of_init(struct iio_dev *indio_dev) return 0; } -static int stm32_adc_dma_request(struct iio_dev *indio_dev) +static int stm32_adc_dma_request(struct device *dev, struct iio_dev *indio_dev) { struct stm32_adc *adc = iio_priv(indio_dev); struct dma_slave_config config; int ret; - adc->dma_chan = dma_request_chan(&indio_dev->dev, "rx"); + adc->dma_chan = dma_request_chan(dev, "rx"); if (IS_ERR(adc->dma_chan)) { ret = PTR_ERR(adc->dma_chan); if (ret != -ENODEV) { if (ret != -EPROBE_DEFER) - dev_err(&indio_dev->dev, + dev_err(dev, "DMA channel request failed with %d\n", ret); return ret; @@ -1816,7 +1816,7 @@ static int stm32_adc_probe(struct platform_device *pdev) if (ret < 0) goto err_clk_disable; - ret = stm32_adc_dma_request(indio_dev); + ret = stm32_adc_dma_request(dev, indio_dev); if (ret < 0) goto err_clk_disable; -- 2.25.1
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