From: Amos Kong <akong@redhat.com>
Date: Thu, 11 Sep 2014 12:50:39 +0000 (+0930)
Subject: virtio-rng: fix stuck of hot-unplugging busy device
X-Git-Tag: fixes-for-v3.18-merge-window~115^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3856e548372513665670ca5db60d9a74b970fe0d;p=pandora-kernel.git

virtio-rng: fix stuck of hot-unplugging busy device

When we try to hot-remove a busy virtio-rng device from QEMU monitor,
the device can't be hot-removed. Because virtio-rng driver hangs at
wait_for_completion_killable().

This patch exits the waiting by completing have_data completion before
unregistering, resets data_avail to avoid the hwrng core use wrong
buffer bytes.

Signed-off-by: Amos Kong <akong@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---

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