linux-kernel - [PATCH] iio: adc: stm32-adc: Fix race in installing chained IRQ handler

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Message-Id: <20250514085138.3221059-1-nichen@iscas.ac.cn>
Date: Wed, 14 May 2025 16:51:38 +0800
From: Chen Ni <nichen@...as.ac.cn>
To: jic23@...nel.org,
	dlechner@...libre.com,
	nuno.sa@...log.com,
	andy@...nel.org,
	mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com,
	u.kleine-koenig@...libre.com,
	robh@...nel.org,
	tglx@...utronix.de,
	jirislaby@...nel.org
Cc: linux-iio@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Chen Ni <nichen@...as.ac.cn>
Subject: [PATCH] iio: adc: stm32-adc: Fix race in installing chained IRQ handler

Fix a race where a pending interrupt could be received and the handler
called before the handler's data has been setup, by converting to
irq_set_chained_handler_and_data().

Signed-off-by: Chen Ni <nichen@...as.ac.cn>
---
 drivers/iio/adc/stm32-adc-core.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
index bd3458965bff..21c04a98b3b6 100644
--- a/drivers/iio/adc/stm32-adc-core.c
+++ b/drivers/iio/adc/stm32-adc-core.c
@@ -430,10 +430,9 @@ static int stm32_adc_irq_probe(struct platform_device *pdev,
 		return -ENOMEM;
 	}
 
-	for (i = 0; i < priv->cfg->num_irqs; i++) {
-		irq_set_chained_handler(priv->irq[i], stm32_adc_irq_handler);
-		irq_set_handler_data(priv->irq[i], priv);
-	}
+	for (i = 0; i < priv->cfg->num_irqs; i++)
+		irq_set_chained_handler_and_data(priv->irq[i],
+						 stm32_adc_irq_handler, priv);
 
 	return 0;
 }
-- 
2.25.1