Creating driver from few source files

[tallu]

Hello There

I'm writing simple driver (in order to learn writing device drivers). Everything worked well until I added another source file to the driver.
When I build it, I get no compilation or linking errors and insmod works fine as well, but the driver doesn't work (I can't see its printings in dmesg and its file in /proc doesn't exist as well). I can rmmod the driver as well.
Does anyone familiar with this kind of problem?

Thanks,
Tal

[Rubberman]

Basic debugging process:

1. Stuff worked.
2. Something changed.
3. Stuff doesn't work.

Questions:

1. What did #2 change?
2. What is it doing?
3. Have you instrumented the code with printk statements to monitor program flow?

[tallu]

Basic debugging process:

1. Stuff worked.
2. Something changed.
3. Stuff doesn't work.

Questions:

1. What did #2 change?
2. What is it doing?
3. Have you instrumented the code with printk statements to monitor program flow?

Hi Rubberman

The only thing that I changed, was adding a new C file to the list of driver modules. Currently the new C file is empty except from license decleration.
Instrumenting the code with printk doesn't help. I added a printk at the begining of the module init function, but nothing is printed to kernel logs...

Tal