Re: Problem faced while using workqueue in the character driver.

Hi Misbah,

I am working on a character driver for FPGA, in which i am using a blocked
read call on workqueue. The read call will be unblocked by the Interrupt
from the Fpga to PPC Cpu.

The problem is that if the process is in blocked mode and then an Interrupt
occurs the system gives kernel Panic where as it get unblocked and start
reading the data but very soon it gets crashed.

Please send me your suggessins regarding the mentioned problem.

Er, without seeing the code, its a bit difficult to suggest
anything.

Perhaps you are using work-queues incorrectly?

Take a look at:

simple_work_queue.c

In the tar-ball

http://www.ovro.caltech.edu/~dwh/correlator/software/driver_design.tar.gz

Which is described in:

http://www.ovro.caltech.edu/~dwh/correlator/pdf/LNX-723-Hawkins.pdf

There's also a more complex 'COBRA driver' here:

http://www.ovro.caltech.edu/~dwh/correlator/cobra_docs.html

Having an example of a working driver that uses work-queues
might help you.

Dave