Commit 5c27ff5db1491a947264d6d4e4cbe43ae6535bae upstream.

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 sergei.shtylyov@cogentembedded.com

--- The patch is against the 'linux-4.9.y' branch of the -stable repo.

drivers/mmc/host/tmio_mmc_pio.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)

Index: linux-stable/drivers/mmc/host/tmio_mmc_pio.c =================================================================== --- linux-stable.orig/drivers/mmc/host/tmio_mmc_pio.c +++ linux-stable/drivers/mmc/host/tmio_mmc_pio.c @@ -675,7 +675,7 @@ static bool __tmio_mmc_sdcard_irq(struct return false; }

-static void tmio_mmc_sdio_irq(int irq, void *devid) +static bool tmio_mmc_sdio_irq(int irq, void *devid) { struct tmio_mmc_host *host = devid; struct mmc_host *mmc = host->mmc; @@ -684,7 +684,7 @@ static void tmio_mmc_sdio_irq(int irq, v 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->sdcard_irq_mask; @@ -697,6 +697,8 @@ static void tmio_mmc_sdio_irq(int irq, v

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) @@ -718,9 +720,10 @@ irqreturn_t tmio_mmc_irq(int irq, void * if (__tmio_mmc_sdcard_irq(host, ireg, status)) return IRQ_HANDLED;

- tmio_mmc_sdio_irq(irq, devid); + if (tmio_mmc_sdio_irq(irq, devid)) + return IRQ_HANDLED;

- return IRQ_HANDLED; + return IRQ_NONE; } EXPORT_SYMBOL(tmio_mmc_irq);