Thread (5 messages) 5 messages, 4 authors, 2025-05-31

Re: [PATCH v2] iio: adc: stm32-adc: Fix race in installing chained IRQ handler

From: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Date: 2025-05-26 15:52:09
Also in: linux-iio, lkml

On 5/25/25 13:07, Jonathan Cameron wrote:
On Thu, 15 May 2025 11:26:56 +0100
Nuno Sá [off-list ref] wrote:
quoted
On Thu, 2025-05-15 at 16:31 +0800, Chen Ni wrote:
quoted
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().

Fixes: d58c67d1d851 ("iio: adc: stm32-adc: add support for STM32MP1")
Signed-off-by: Chen Ni <redacted>
---  
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Looks good to me and I've queued it up for after rc1.  If any
ST folk have time to take a look that would be great.
Hi Jonathan,

One minor comment at my end, not sure if that changes a lot...
This could be a fix for the older commit:
1add69880240 ("iio: adc: Add support for STM32 ADC core")

Apart from that, you can add my:
Tested-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>

BR,
Fabrice
Jonathan
quoted
quoted
Changelog:

v1 -> v2:

1. Add Fixes tag.
---
 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;
 }  
  
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