* Matthias Klein | 2013-10-02 14:54:00 [+0000]:

Hello,

Hi,

i am writing a kernel module on a rt kernel where I have an
IRQF_NO_THREAD interrupt.

I hope you know what you are doing with this.

For sharing a "write index" between that interrupt and the process
context (ioctl() etc.) I use a spin_lock for locking.

In the IRQ I use spin_lock() & spin_unlock(), and in the process
context I use spin_lock_irq() & spin_unlock_irq().

Basically the driver and the test application are working, but after
some time I get an oops message.

Do I use the right functions for locking ? Do you have a tip why I
get that oops message ?

You should use a the raw_spinlock here if you _really_ need
IRQF_NO_THREAD.

Best regards,

Matthias

Sebastian