From 8717fd6d0c30d2d832a8edfd34d1abe7aeff6df2 Mon Sep 17 00:00:00 2001 From: Wadim Egorov Date: Mon, 25 Sep 2023 15:44:27 +0200 Subject: [PATCH] iio: adc: ti_am335x_adc: Fix return value check of tiadc_request_dma() commit 60576e84c187043cef11f11d015249e71151d35a upstream. Fix wrong handling of a DMA request where the probing only failed if -EPROPE_DEFER was returned. Instead, let us fail if a non -ENODEV value is returned. This makes DMAs explicitly optional. Even if the DMA request is unsuccessfully, the ADC can still work properly. We do also handle the defer probe case by making use of dev_err_probe(). Fixes: f438b9da75eb ("drivers: iio: ti_am335x_adc: add dma support") Signed-off-by: Wadim Egorov Reviewed-by: Bhavya Kapoor Link: https://lore.kernel.org/r/20230925134427.214556-1-w.egorov@phytec.de Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/adc/ti_am335x_adc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c index 9d984f2a8ba7..38d8a01d9f95 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -656,8 +656,10 @@ static int tiadc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, indio_dev); err = tiadc_request_dma(pdev, adc_dev); - if (err && err == -EPROBE_DEFER) + if (err && err != -ENODEV) { + dev_err_probe(&pdev->dev, err, "DMA request failed\n"); goto err_dma; + } return 0;