linux-kernel - [PATCH] Fix IRQ issue by setting IRQ_DISABLE

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Date:   Mon,  6 Mar 2023 13:47:37 +0900
From:   Masahiro Honda <honda@...hatrax.com>
To:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Masahiro Honda <honda@...hatrax.com>
Subject: [PATCH] Fix IRQ issue by setting IRQ_DISABLE_UNLAZY flag

ADC using ad7793.ko, such as AD7794, may read incorrect data.
Extra interrupt is pending if the data on DOUT contains a falling edge.
Therefore, wait_for_completion_timeout returns immediately.
This patch fixes the issue by setting IRQ_DISABLE_UNLAZY flag.

Signed-off-by: Masahiro Honda <honda@...hatrax.com>
---
 drivers/iio/adc/ad_sigma_delta.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c
index d8570f620..364051809 100644
--- a/drivers/iio/adc/ad_sigma_delta.c
+++ b/drivers/iio/adc/ad_sigma_delta.c
@@ -584,6 +584,7 @@ static int devm_ad_sd_probe_trigger(struct device *dev, struct iio_dev *indio_de
 	init_completion(&sigma_delta->completion);
 
 	sigma_delta->irq_dis = true;
+	irq_set_status_flags(sigma_delta->spi->irq, IRQ_DISABLE_UNLAZY);
 	ret = devm_request_irq(dev, sigma_delta->spi->irq,
 			       ad_sd_data_rdy_trig_poll,
 			       sigma_delta->info->irq_flags | IRQF_NO_AUTOEN,
-- 
2.34.1