WHY pwm driver works when insmod as module, while crash when build-in kernel?

Kevin Chow

Hi,

I am debugging a pwm driver in am3517, I found a curious problem, when I compile the driver as .ko, and insmod, it works well, but when I build it into kernel, the kernel will crash.

This file is my pwm driver file:

1586.am3517_bl.c.txt

The following is error console log:

4300.console-log.txt

Thanks,

Kevin

over 14 years ago

0 Vaibhav Hiremath over 14 years ago

TI__Expert 8180 points

Looking at the crash, it looks like the clock is disabled for the module and you are trying to access the register. Try disabling option "CONFIG_OMAP_RESET_CLOCKS" in kernel config.

Side NOTE: From Linux point of view the Driver is written very badly, request you to follow Linux framework (and possible Linux coding style).

Thanks,

Vaibhav

0 Kevin Chow over 14 years ago in reply to Vaibhav Hiremath

Expert 1625 points

Thanks very much.

Vaibhav Hiremath said:
Looking at the crash, it looks like the clock is disabled for the module and you are trying to access the register. Try disabling option "CONFIG_OMAP_RESET_CLOCKS" in kernel config.

It seems the reason for that problem, and I will improve my driver to better format.

Regards,

Kevin

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WHY pwm driver works when insmod as module, while crash when build-in kernel?