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Question

Kernel crash - NULL pointer dereference when calling DEVICE_

by miteshgaware / January 19, 2014 5:25 PM PST

Hello Friends,
I'm writing a simple USB driver to drive a stepper motor based on USB Skeleton 2.2 Driver, kernel 3.8. The basic version is running properly. As a advancement, I introduced KTHREAD to call the DEVICE_WRITE (skel_write) (), so that the driver will be available for other tasks & requests.

Calling procedure : USER (request) -> DEVICE_IOCTL -> KTHREAD -> DEVICE_WRITE.

In this scenario, when I call the DEVICE_WRITE multiple times from KTHREAD through a loop, everything works fine. Then after some iterations, kernel gets messed up.
I'm new to kernel programming and might be missing out something.
Thankyou for your support and time.

Regards,
Mitesh

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