Darren J Moffat wrote:
Richard L. Hamilton wrote:
Unfortunately, I'm not sure how well it works: an
DEBUG kernel can try
to unload the module at any time.
But a loadable module can refuse to be unloaded based on the return
from _fini(),
right?
Yes but that is considered pretty rude, especially if this module
would otherwise be able to be unloaded and the only reason for doing
that is to avoid the modload vs 'modunload -i 0' race condition.
For drivers (you can't do this for misc modules) you can use a special
property: ddi-no-autodetach. This property, if non-zero, indicates that
modunload -i 0 will not try to detach instances of your device in
response to modunload -i 0. I know of particular devices where this is
important -- the audio drivers do it so that they won't lose settings
just because nobody is using the device at the precise time that
modunload -i 0 is called.
Note that this properly still allows the device to be properly unloaded
by a targetted modunload.
- Garrett
--
Darren J Moffat
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