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 <tglx@xxxxxxxxxxxxx>
Date: Thu Apr 19 10:35:17 2012 +0200
genirq: Reject bogus threaded irq requests
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.
...
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