Reboot not calling module_exit of LKM
Greg KH
greg at kroah.com
Fri Aug 5 15:06:30 EDT 2011
On Fri, Aug 05, 2011 at 11:39:16AM -0700, Ramesh.P wrote:
> Hi,
>
> Good day!
>
> When a system is rebooted, the loadable kernel modules 'module_exit'
> functions are not called. I see this behavior in a custom kernel. My
> questions are
>
> a. Is this applicable in mainline/normal kernel too?
Yes.
> b. If yes, what are the reasons? (One reason may be, not to get into
> new problems while cleaning up the module)
You don't need to unload a module as the machine is about to be turned
off.
> c. Is there anyway for the kernel module to know the system is getting
> rebooted? (Apart from letting userspace to indicate the kernel
> module).
Yes, hook to the reboot notifier.
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