insmod error “unknown symbol in module”

问题

I am writing parallel LED board driver, .ko is successfully generated.

I am facing this issue

[63722.594233] led: Unknown symbol parport_register_device (err 0)

[63722.594264] led: Unknown symbol parport_register_driver (err 0)

回答1:

parport_register_device is exported in drivers/parport/share.c. So you have to load parport driver first (modprobe parport) and then your driver.

来源：https://stackoverflow.com/questions/22954268/insmod-error-unknown-symbol-in-module