md (regression): reboot/shutdown hangs

[Alistair John Strachan]

Hi Neil,

Commit 2b25000bf5157c28d8591f03f0575248a8cbd900 ("Restore force switch of md 
array to readonly at reboot time.") causes a reboot/shutdown to hang 
indefinitely on my box. Reverting this single commit makes the problem go 
away. It was first released with 2.6.27-rc3, I believe, and so this is a 
regression vs 2.6.26 (Rafael CCed).

I think the problem might be because my rootfs is on a RAID5 and my distro 
fails to stop it completely before halt/reboot.

Please let me know if there's any more information you need from me.

-- 
Cheers,
Alistair.
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