On Mon, 11 Jun 2012, [email protected] wrote: > Hi all > > I noticed that mmc_cd_gpio_request() failed on request_threaded_irq(). > Now, I'm using v3.5-rc2 kernel. > > current ${LINUX}/drivers/mmc/core/cd-gpio.c :: mmc_cd_gpio_request() uses > > request_threaded_irq(irq, NULL, mmc_cd_gpio_irqt, > IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, > cd->label, host); > > It doesn't have hander (2nd is NULL), and flag doesn't have IRQF_ONESHOT. > Then, it run request_threaded_irq() -> __setup_irq() > and, it got this error. > > pr_err("Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n", > irq); > > I'm not sure detail of it, but maybe from this commit > > ------------------------------------------- > commit 1c6c69525b40eb76de8adf039409722015927dc3 > Author: Thomas Gleixner <[email protected]> > Date: Thu Apr 19 10:35:17 2012 +0200 > > genirq: Reject bogus threaded irq requests
Also see this thread: https://lkml.org/lkml/2012/6/12/151 For now you can add an IRQF_ONESHOT flag to the call. Thanks Guennadi > > Requesting a threaded interrupt without a primary handler and without > IRQF_ONESHOT set is dangerous. > > The core will use the default primary handler for it, which merily > wakes the thread. For a level type interrupt this results in an > interrupt storm, because the interrupt line is reenabled after the > primary handler runs. The device has still the line asserted, which > brings us back into the primary handler. > ... > ------------------------------------------ > -- > 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 > --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- 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
