linux-kernel - [PATCH 5.10 082/102] iio: adc: stm32: Fix IRQs on STM32F4 by removing custom spurious IRQs message

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Date:   Mon, 27 Jun 2022 13:21:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Yannick Brosseau <yannick.brosseau@...il.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.10 082/102] iio: adc: stm32: Fix IRQs on STM32F4 by removing custom spurious IRQs message

From: Yannick Brosseau <yannick.brosseau@...il.com>

commit 99bded02dae5e1e2312813506c41dc8db2fb656c upstream.

The check for spurious IRQs introduced in 695e2f5c289bb assumed that the bits
in the control and status registers are aligned. This is true for the H7 and MP1
version, but not the F4. The interrupt was then never handled on the F4.

Instead of increasing the complexity of the comparison and check each bit specifically,
we remove this check completely and rely on the generic handler for spurious IRQs.

Fixes: 695e2f5c289b ("iio: adc: stm32-adc: fix a regression when using dma and irq")
Signed-off-by: Yannick Brosseau <yannick.brosseau@...il.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Link: https://lore.kernel.org/r/20220516203939.3498673-3-yannick.brosseau@gmail.com
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iio/adc/stm32-adc.c |   10 ----------
 1 file changed, 10 deletions(-)

--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -1265,7 +1265,6 @@ static irqreturn_t stm32_adc_threaded_is
 	struct stm32_adc *adc = iio_priv(indio_dev);
 	const struct stm32_adc_regspec *regs = adc->cfg->regs;
 	u32 status = stm32_adc_readl(adc, regs->isr_eoc.reg);
-	u32 mask = stm32_adc_readl(adc, regs->ier_eoc.reg);
 
 	/* Check ovr status right now, as ovr mask should be already disabled */
 	if (status & regs->isr_ovr.mask) {
@@ -1280,11 +1279,6 @@ static irqreturn_t stm32_adc_threaded_is
 		return IRQ_HANDLED;
 	}
 
-	if (!(status & mask))
-		dev_err_ratelimited(&indio_dev->dev,
-				    "Unexpected IRQ: IER=0x%08x, ISR=0x%08x\n",
-				    mask, status);
-
 	return IRQ_NONE;
 }
 
@@ -1294,10 +1288,6 @@ static irqreturn_t stm32_adc_isr(int irq
 	struct stm32_adc *adc = iio_priv(indio_dev);
 	const struct stm32_adc_regspec *regs = adc->cfg->regs;
 	u32 status = stm32_adc_readl(adc, regs->isr_eoc.reg);
-	u32 mask = stm32_adc_readl(adc, regs->ier_eoc.reg);
-
-	if (!(status & mask))
-		return IRQ_WAKE_THREAD;
 
 	if (status & regs->isr_ovr.mask) {
 		/*