Re: calling soo_write() from itimer handler

[mlelstv%serpens.de@localhost (Michael van Elst)]

beesdeckar%softinengines.com@localhost (Beesdeckar) writes:

>I have kernel 10.1 rebuilt with DEBUG LOCKDEBUG and DIAGNOSTIC flags to 
>test my kernel module.

>When used release kernel 10.1 then it runs and soo_write() does its work 
>fine. In my debug version of kernel compiled with above flags it stops 
>on assert_sleepable(), stack is added below.

>My questions are:
>If soo_write() cannot be called from software interrupt what should I 
>change  to call soo_write() on kernel timer tick ?


soo_write() may sleep, and that's not allowed in software interrupts.
You need to run soo_write() from a kernel thread (often a work queue
is used which implies a thread).

Since the thread runs asynchronously, you have to decide what to do,
when the timer expires while the previous action hasn't finished
yet.