Unload a kernel module in use

lsmod will tell you who is using the module. Remove the user module first.

First, find out, which other modules use the module sdhci:

lsmod | grep sdhci

You will get a list like this:

module size used_by

and then try unloading these modules (used_by) before or together with the module you want to unload.

Unload a kernel module in use

原文：http://www.cnblogs.com/tiffer/p/6411446.html