patch "iio: adc: stm32: Fix IRQs on STM32F4 by removing custom spurious IRQs" added to char-misc-linus

This is a note to let you know that I've just added the patch titled

iio: adc: stm32: Fix IRQs on STM32F4 by removing custom spurious IRQs

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 99bded02dae5e1e2312813506c41dc8db2fb656c Mon Sep 17 00:00:00 2001
From: Yannick Brosseau <[email protected]>
Date: Mon, 16 May 2022 16:39:39 -0400
Subject: iio: adc: stm32: Fix IRQs on STM32F4 by removing custom spurious IRQs
message

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.

---
 drivers/iio/adc/stm32-adc.c | 10 ----------
 1 file changed, 10 deletions(-)

index a68ecbda6480..8c5f05f593ab 100644
@@ -1407,7 +1407,6 @@ static irqreturn_t stm32_adc_threaded_isr(int irq, void *data)
 	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) {

@@ -1422,11 +1421,6 @@ static irqreturn_t stm32_adc_threaded_isr(int irq, void *data)
 		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;
 }
 

@@ -1436,10 +1430,6 @@ static irqreturn_t stm32_adc_isr(int irq, void *data)
 	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) {
 		/*

2.36.1