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FAILED: patch "[PATCH] mmc: tmio_mmc_core: don't claim spurious interrupts" failed to apply to 4.9-stable tree

PATCH [email protected] 1 participant 1 message Mar 2, 2019

Subsystems (3)
Stable branch MMC, SD and SDIO TMIO/SDHI MMC driver
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The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5c27ff5db1491a947264d6d4e4cbe43ae6535bae Mon Sep 17 00:00:00 2001
From: Sergei Shtylyov <[email protected]>
Date: Mon, 18 Feb 2019 20:45:40 +0300
Subject: [PATCH] mmc: tmio_mmc_core: don't claim spurious interrupts

I have encountered an interrupt storm during the eMMC chip probing (and the chip finally didn't get detected). It turned out that U-Boot left the DMAC interrupts enabled while the Linux driver didn't use those. The SDHI driver's interrupt handler somehow assumes that, even if an SDIO interrupt didn't happen, it should return IRQ_HANDLED. I think that if none of the enabled interrupts happened and got handled, we should return IRQ_NONE -- that way the kernel IRQ code recoginizes a spurious interrupt and masks it off pretty quickly...

Fixes 7729c7a232a9 ("mmc: tmio: Provide separate interrupt handlers")
Signed-off-by Sergei Shtylyov <[email protected]>
Reviewed-by Wolfram Sang <[email protected]>
Tested-by Wolfram Sang <[email protected]>
Reviewed-by Simon Horman <[email protected]>
Cc [email protected]
Signed-off-by Ulf Hansson <[email protected]>
drivers/mmc/host/tmio_mmc_core.c +7 -4
index 085a0fab769c..41d79720e745 100644
@@ -629,7 +629,7 @@ static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host, int ireg,
 	return false;
 }
 
-static void __tmio_mmc_sdio_irq(struct tmio_mmc_host *host)
+static bool __tmio_mmc_sdio_irq(struct tmio_mmc_host *host)
 {
 	struct mmc_host *mmc = host->mmc;
 	struct tmio_mmc_data *pdata = host->pdata;

@@ -637,7 +637,7 @@ static void __tmio_mmc_sdio_irq(struct tmio_mmc_host *host)
 	unsigned int sdio_status;
 
 	if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
-		return;
+		return false;
 
 	status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
 	ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdio_irq_mask;

@@ -650,6 +650,8 @@ static void __tmio_mmc_sdio_irq(struct tmio_mmc_host *host)
 
 	if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
 		mmc_signal_sdio_irq(mmc);
+
+	return ireg;
 }
 
 irqreturn_t tmio_mmc_irq(int irq, void *devid)

@@ -668,9 +670,10 @@ irqreturn_t tmio_mmc_irq(int irq, void *devid)
 	if (__tmio_mmc_sdcard_irq(host, ireg, status))
 		return IRQ_HANDLED;
 
-	__tmio_mmc_sdio_irq(host);
+	if (__tmio_mmc_sdio_irq(host))
+		return IRQ_HANDLED;
 
-	return IRQ_HANDLED;
+	return IRQ_NONE;
 }
 EXPORT_SYMBOL_GPL(tmio_mmc_irq);