From: Rusty Russell <rusty@rustcorp.com.au>
Date: Sat, 13 Jun 2009 04:27:02 +0000 (-0600)
Subject: lguest: fix race in halt code
X-Git-Tag: v2.6.31-rc1~368^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=abd41f037e1a64543000ed73b42f616d04d92700;p=pandora-kernel.git

lguest: fix race in halt code

When the Guest does the LHCALL_HALT hypercall, we go to sleep, expecting
that a timer or the Waker will wake_up_process() us.

But we do it in a stupid way, leaving a classic missing wakeup race.

So split maybe_do_interrupt() into interrupt_pending() and
try_deliver_interrupt(), and check maybe_do_interrupt() and the
"break_out" flag before calling schedule.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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