04-22-2011
Yes, this is FreeBSD and is standalone. This is the first time the computer is restarted after an install a week earlier, so likely to happen again after every restart.
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hi
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LEARN ABOUT SUSE
request_threaded_irq
REQUEST_THREADED_IRQ(9) Hardware Interfaces REQUEST_THREADED_IRQ(9)
NAME
request_threaded_irq - allocate an interrupt line
SYNOPSIS
int request_threaded_irq(unsigned int irq, irq_handler_t handler, irq_handler_t thread_fn, unsigned long irqflags, const char * devname,
void * dev_id);
ARGUMENTS
irq
Interrupt line to allocate
handler
Function to be called when the IRQ occurs. Primary handler for threaded interrupts If NULL and thread_fn != NULL the default primary
handler is installed
thread_fn
Function called from the irq handler thread If NULL, no irq thread is created
irqflags
Interrupt type flags
devname
An ascii name for the claiming device
dev_id
A cookie passed back to the handler function
DESCRIPTION
This call allocates interrupt resources and enables the interrupt line and IRQ handling. From the point this call is made your handler
function may be invoked. Since your handler function must clear any interrupt the board raises, you must take care both to initialise your
hardware and to set up the interrupt handler in the right order.
If you want to set up a threaded irq handler for your device then you need to supply handler and thread_fn. handler ist still called in
hard interrupt context and has to check whether the interrupt originates from the device. If yes it needs to disable the interrupt on the
device and return IRQ_WAKE_THREAD which will wake up the handler thread and run thread_fn. This split handler design is necessary to
support shared interrupts.
Dev_id must be globally unique. Normally the address of the device data structure is used as the cookie. Since the handler receives this
value it makes sense to use it.
If your interrupt is shared you must pass a non NULL dev_id as this is required when freeing the interrupt.
FLAGS
IRQF_SHARED Interrupt is shared IRQF_DISABLED Disable local interrupts while processing IRQF_SAMPLE_RANDOM The interrupt can be used for
entropy IRQF_TRIGGER_* Specify active edge(s) or level
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 REQUEST_THREADED_IRQ(9)