On Wed, 29 Aug 2007 19:33:48 -0600 Robert Hancock <[email protected]> wrote:
> Andrew Morton wrote:
> > On Wed, 29 Aug 2007 11:33:06 -0700 (PDT) [email protected] wrote:
> >
> >> http://bugzilla.kernel.org/show_bug.cgi?id=8957
> >>
> >> Summary: Exported functions and variables should not be reachable
> >> by the outside of the module until module_init finishes
> >> Product: Other
> >> Version: 2.5
> >> KernelVersion: 2.6.23-rc4
> >> Platform: All
> >> OS/Version: Linux
> >> Tree: Mainline
> >> Status: NEW
> >> Severity: normal
> >> Priority: P1
> >> Component: Modules
> >> AssignedTo: [email protected]
> >> ReportedBy: [email protected]
> >>
> >>
> >> Problem Description: a module's exported functions can be called before before
> >> they are properly initialized by the module_init function.
> >>
> >> Steps to reproduce: write a module that exports functions that require
> >> initialization by the module_init function to work correctly.
> >>
> >> E.g. spin lock variables are no longer allowed to be initialized by C
> >> initializers of the module but only by spin_lock_init that can be called by the
> >> module_init function. If an exported function calls spin_lock before it is
> >> initialized, it deadlocks.
> >>
> >
> > ooh, nice bug ;)
>
> Under what circumstances is this actually happening? What are these
> functions that are being called?
>
> Normally things are set up such that this isn't a problem, i.e. if
> module A depends on module B, module A can't load until module B is
> finished loading.
>
Good point.
This thus-far-undescribed module could make its internals externally
visible via one of the kernel's many register_foo() interfaces, but it
would be a buggy module if it was doing register_foo(my_foo) before
my_foo() was ready to be called.
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