From: Michael S. Tsirkin <mst@redhat.com>
Date: Thu, 5 Mar 2015 02:54:41 +0000 (+1030)
Subject: virtio_balloon: set DRIVER_OK before using device
X-Git-Tag: omap-for-v4.2/o2_dc~305^2~8
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88660f7fb94cda1f8f63ee92bfcd0db39a6361e2;p=pandora-kernel.git

virtio_balloon: set DRIVER_OK before using device

virtio spec requires that all drivers set DRIVER_OK
before using devices. While balloon isn't yet
included in the virtio 1 spec, previous spec versions
also required this.

virtio balloon might violate this rule: probe calls
kthread_run before setting DRIVER_OK, which might run
immediately and cause balloon to inflate/deflate.

To fix, call virtio_device_ready before running the kthread.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
---

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