patch: fix ata panic with Thinkpad CD and DVD drives

[Simon L. Nielsen]

On 2005.02.27 11:56:06 -0800, Nate Lawson wrote:
> If you've been having "memory modified after free" panics on -current 
> and have a Thinkpad, the attached patch should fix things for you.  A 
> quick check of RELENG_5 indicates that the bug is probably there also 
> but I haven't tested for it there.

I don think it's in RELENG_5.  The commit that (re)introduced the
problem haven't been MFC'ed as far as I know, but I can't test it at
the moment.

It should also be noted that ATA MKIII also fixes this problem, at
least it did for me.

-- 
Simon L. Nielsen
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