When using MSI it is possible that a new MSI is sent while an earlier MSI is currently handled. In this case SDHCI_INT_STATUS only contains SDHCI_INT_RESPONSE and the ISR would not be called again. But at the end of the ISR SDHCI_INT_DATA_END is now also pending which would be ignored.
Fix this by rereading the interrupt flags in the ISR until no interrupt we care is pending. Signed-off-by: Alexander Stein <[email protected]> --- drivers/mmc/host/sdhci.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 8d66706..654ab32 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2268,6 +2268,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id) irqreturn_t result; struct sdhci_host *host = dev_id; u32 intmask; + u32 intmask_unhandled; int cardint = 0; spin_lock(&host->lock); @@ -2286,6 +2287,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id) goto out; } +again: DBG("*** %s got interrupt: 0x%08x\n", mmc_hostname(host->mmc), intmask); @@ -2336,6 +2338,14 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id) sdhci_writel(host, SDHCI_INT_BUS_POWER, SDHCI_INT_STATUS); } + intmask_unhandled = intmask; + + intmask = sdhci_readl(host, SDHCI_INT_STATUS); + + /* Do interrupt handling again if we got new flags */ + if (intmask & ~intmask_unhandled) + goto again; + intmask &= ~SDHCI_INT_BUS_POWER; if (intmask & SDHCI_INT_CARD_INT) -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
