On Fri, 21 Jan 2011, zhangfei gao wrote: > >From b7be39e0bbac3950057078ac66900ebc0871f77e Mon Sep 17 00:00:00 2001 > From: Zhangfei Gao <zhangfei.gao@xxxxxxxxxxx> > Date: Fri, 21 Jan 2011 18:02:47 -0500 > Subject: [PATCH] mmc: clear all interrupt in suspend before free_irq > > When debugging wifi host sleep, race condition about > SDHCI_INT_CARD_INT happens. > Host free_irq in suspend and request_irq when resume back. > However SDHCI_INT_CARD_INT is not cleared, so interrupt will > immediately happen after request_irq. > mmc_signal_sdio_irq will be called and wakeup sdio_irq_thread. > As a result irq_handler in sdio driver is called even before host resume back. > > The correct case is mmc_sdio_resume calls mmc_signal_sdio_irq to > wakeup sdio_irq_thread > > Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxxx> That makes sense, as long as the masking of interrupts doesn't prevent a SDIO card interrupt from waking up the host system. > --- > drivers/mmc/host/sdhci.c | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index aacd78c..97074ae 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -1707,6 +1707,7 @@ int sdhci_suspend_host(struct sdhci_host *host, > pm_message_t state) > ret = mmc_suspend_host(host->mmc); > if (ret) > return ret; > + sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, 0); > > free_irq(host->irq, host); > > -- > 1.7.0.4 > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
