From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 13 Mar 2014 00:53:38 +0000 (+1030)
Subject: virtio_balloon: don't softlockup on huge balloon changes.
X-Git-Tag: v3.15-rc1~119^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1f74ef0f2d7d692fcd615621e0e734c3e7771413;p=pandora-kernel.git

virtio_balloon: don't softlockup on huge balloon changes.

When adding or removing 100G from a balloon:

    BUG: soft lockup - CPU#0 stuck for 22s! [vballoon:367]

We have a wait_event_interruptible(), but the condition is always true
(more ballooning to do) so we don't ever sleep.  We also have a
wait_event() for the host to ack, but that is also always true as QEMU
is synchronous for balloon operations.

Reported-by: Gopesh Kumar Chaudhary <gopchaud@in.ibm.com>
Cc: stable@kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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