kldunload(8) returns 0, although it fail

[CyberLeo Kitsana]

On 11/03/2010 05:34 PM, Alexander Best wrote:
> hi there,
> 
> is this a known issue with kldunload(8)?
> 
> ***beginn***
> otaku% kldunload sound
> otaku% echo $?
> 0
> otaku% kldstat
> Id Refs Address            Size     Name
>  1   35 0xffffffff80100000 a2da40   kernel
>  2    1 0xffffffff80b2e000 295e8    snd_hda.ko
>  3    1 0xffffffff80b58000 85110    sound.ko
>  4    1 0xffffffff80bde000 da4bb8   nvidia.ko
>  5    4 0xffffffff81983000 418e0    linux.ko
>  6    1 0xffffffff819c5000 80e8     ng_ubt.ko
>  7    2 0xffffffff819ce000 fa78     ng_hci.ko
>  8    2 0xffffffff819de000 2bd0     ng_bluetooth.ko
>  9    3 0xffffffff819e1000 15e68    netgraph.ko
> 10    1 0xffffffff81c12000 3edb     linprocfs.ko
> 11    3 0xffffffff81c16000 4698     pseudofs.ko
> 12    1 0xffffffff81c1b000 31b3     procfs.ko
> 13    1 0xffffffff81c1f000 a37      linsysfs.ko
> otaku% kldunload sound
> kldunload: attempt to unload file that was loaded by the kernel
> kldunload: can't unload file: Device busy

sound.ko was presumably loaded by snd_hda.ko, as it is a dependency. You
must unload all the modules depending on sound.ko before it will unload.
At that point, I believe I've seen it unload itself.

Same with netgraph.ko, and the modules that require it (ng_*.ko).

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