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SubjectRe: [Bugme-new] [Bug 8957] New: Exported functions and variables should not be reachable by the outside of the module until module_init finishes
Andrew Morton wrote:
> On Wed, 29 Aug 2007 11:33:06 -0700 (PDT) bugme-daemon@bugzilla.kernel.org 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: other_modules@kernel-bugs.osdl.org
>> ReportedBy: mattilinnanvuori@yahoo.com
>>
>>
>> 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.

--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/

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