On Tuesday 13 November 2007 01:18:27 Jan Glauber wrote:
> If module A depends on module B and module B has not yet finished its
> init() the module loader may print a warning about an unknown symbol.
>
> This happens if module B is still in state MODULE_STATE_COMING,
> as module A runs into resolve_symbol() for a symbol from module B.
> resolve_symbol() return 0 in that case and causes the warning.
It also happens when a symbol is undefined, so this patch is a bad idea.
To do this properly you would change strong_try_module_get to return -EBUSY
and -ENOENT, then change use_module(), then finally resolve_symbol(), then
only print a warning when it returns something other than -EBUSY.
Better might be to put in a waitqueue and wake it up whenever a module is
deleted or changes status. Then use_module() can wait if
strong_try_module_get() returns -EBUSY (up to 30 seconds, then print a
warning and fail).
Hope that helps,
Rusty.
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