can I call kill_fasync( ) from interrupt context

nickolais · 03-02-2009, 05:45 PM

Hello,
I have a custom driver for some custom hardware. When my driver receives an interrupt I would like to notify a sigaction( ) registered application that there is data available for reading or writing. Can I do this from my ISR, or do I need to spin off a worker to perform this. Essentially, I need to know will kill_fasyn( ) sleep. Are there any web resources that list what functions are callable from ISR.

Thanks!

nickolais · 03-12-2009, 01:08 PM

I am happy no one answered this for me becuase I was able to find the answer after I searched the kernel sources. Honestly, I am not usually a post first, look later kind of person.

Right above the kill_fasync() function prototype there is a comment stating that the function "/* can be called from interrupts */".

Bye.

kapil_181 · 06-04-2009, 08:47 AM

Hi,

I am trying similar thing here. trying to call a kill_fasync from an interrupt context, in order to wake up a user land application at interrupt. It works without an problem at first kenel module run.

But when I reload my kernel module, the SIGIOs from kill_fasync are never reported to user space. But this is only happening with ISR. The other kernel handler functions like timer is able to kill_fasync without problem.

Some helping directions will be much appreciated.

Thanks