On Mon, 26 Jun 2000, David Woodhouse wrote:
>
> viro@math.psu.edu said:
> > Module removal can not start until the counter is zero, what are you
> > talking about?
>
> In any case where code blindly uses MOD_INC_USE_COUNT rather than
> try_inc_mod_count(), the counter can be non-zero by the time
> cleanup_module() is entered.
Erm... There is one case when MOD_INC_USE_COUNT is kosher and even needed,
but it's pretty convoluted. Consider modules A, B and C.
A provides register_foo() and unregister_foo()
B provides foo1
C does register_foo(&foo1) and unregister_foo(&foo1) for ioctls on
some device.
Notice that C depends on A and B, but A and B are independent. However,
once foo1 is registered we want A to be pinned down. MOD_INC_USE_COUNT in
register_foo() is OK here - C depends on A and if we have C around the A
will stay there...
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This archive was generated by hypermail 2b29 : Mon Jun 26 2000 - 21:00:09 EST