CODEWITHSUNDEEP
cmodulelinux-kernellinux-device-driver
azulay7
azulay7

Reputation: 305

failing on rmmod

I'm failing rmmod lcd_module.ko ERROR: Removing 'lcd_module': Device or resource busy

lssmod give me result: lcd_module [permanent]

how do I cancel this option? I want to load my module more than one time for testing.

thank you on advance.

*if I try to install with modprobe it wont recognize my module.

Upvotes: 4

Views: 4144

Answers (2)

Will Tate
Will Tate

Reputation: 33509

Also, you can attempt to force the kernel to remove the module with rmmod -f lcd_module. Cautionary note: This can cause system failure depending on what kind of resources your module has a hold of and what state its in when you try to force the removal.

Upvotes: 0

pts
pts

Reputation: 87381

You have to implement the module_exit function in your .c file, like this:

static void __exit myexit(void) {}
module_exit(myexit);

If you haven't already done so before loading your module with insmod, then the only way to remove that module is rebooting.

Upvotes: 7

Related Questions