Comment 5 for bug 1323165

This is not HP-specific and also happens on Dell HW. I'll take this as the tracking bug. This commit suggests that the BUG_ON is actually bogus:

http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=107437febd495a50e2cd09c81bbaa84d30e57b07

In the referenced thread there was a Cc to stable@, but that apparently got dropped when the patch was put into tip. This is *not* part of 3.15 yet. Instead it's currently staged for the next merge window.