kern/122045: [ata][panic] reiniting detached ata channel kills the kernel

[soralx at cydem.org]

> Submitter:
> please send us ouput of `mount'.
> I think you're detaching a disk which holds mounted filesystems, 
> which is a really, really bad idea.

nope, I for sure unmounted the only filesystem it holds befoe issuing
`atacontrol detach`

> http://www.freebsd.org/cgi/query-pr.cgi?pr=122045

[SorAlx]  ridin' VS1400