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iio: adc: ti_am335x_adc: Fix return value check of tiadc_request_dma()

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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 <w.egorov@phytec.de>
Reviewed-by: Bhavya Kapoor <b-kapoor@ti.com>
Link: https://lore.kernel.org/r/20230925134427.214556-1-w.egorov@phytec.de
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wadim Egorov 2023-09-25 15:44:27 +02:00 committed by Ksawlii
parent 93352e8dc6
commit 14f94231f0
1 changed files with 3 additions and 1 deletions
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4
drivers/iio/adc/ti_am335x_adc.c
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@ -640,8 +640,10 @@ 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;