From: Wadim Egorov w.egorov@phytec.de
stable inclusion from stable-v6.6.9 commit 7116fa37b2f20f871c59e5741f7978260feabdf1 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8SU2D
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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 Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- 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 8db7a01cb5fb..5f8795986995 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -670,8 +670,10 @@ 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;