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31.4. Unloading a Module

You can unload a kernel module by running modprobe -r <module_name> as root. For example, assuming that the wacom module is already loaded into the kernel, you can unload it by running: 
~]# modprobe -r wacom
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However, this command will fail if a process is using:
  • the wacom module,
  • a module that wacom directly depends on, or,
  • any module that wacom—through the dependency tree—depends on indirectly.
See Section 31.1, “Listing Currently-Loaded Modules” for more information about using lsmod to obtain the names of the modules which are preventing you from unloading a certain module.
For example, if you want to unload the firewire_ohci module (because you believe there is a bug in it that is affecting system stability, for example), your terminal session might look similar to this: 
~]# modinfo -F depends firewire_ohci
depends:        firewire-core
~]# modinfo -F depends firewire_core
depends:        crc-itu-t
~]# modinfo -F depends crc-itu-t
depends:
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You have figured out the dependency tree (which does not branch in this example) for the loaded Firewire modules: firewire_ohci depends on firewire_core, which itself depends on crc-itu-t.
You can unload firewire_ohci using the modprobe -v -r <module_name> command, where -r is short for --remove and -v for --verbose: 
~]# modprobe -r -v firewire_ohci
rmmod /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/firewire/firewire-ohci.ko
rmmod /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/firewire/firewire-core.ko
rmmod /lib/modules/2.6.32-71.el6.x86_64/kernel/lib/crc-itu-t.ko
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The output shows that modules are unloaded in the reverse order that they are loaded, given that no processes depend on any of the modules being unloaded.

Important

Although the rmmod command can be used to unload kernel modules, it is recommended to use modprobe -r instead.
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