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From bf7aa4bb11e9991a3d5a1007dbe52dd0ac6dae99 Mon Sep 17 00:00:00 2001
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From: Ladi Prosek <lprosek@redhat.com>
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Date: Wed, 5 Oct 2016 17:22:25 +0200
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Subject: [PATCH 3/8] virtio: decrement vq->inuse in virtqueue_discard()
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RH-Author: Ladi Prosek <lprosek@redhat.com>
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Message-id: <1475666548-9186-4-git-send-email-lprosek@redhat.com>
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Patchwork-id: 72482
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O-Subject: [RHEL-7.4 qemu-kvm v2 PATCH 3/6] virtio: decrement vq->inuse in virtqueue_discard()
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Bugzilla: 1377968
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Stefan Hajnoczi <stefanha@redhat.com>
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virtqueue_discard() moves vq->last_avail_idx back so the element can be
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popped again. It's necessary to decrement vq->inuse to avoid "leaking"
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the element count.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 58a83c61496eeb0d31571a07a51bc1947e3379ac)
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Signed-off-by: Ladi Prosek <lprosek@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/virtio/virtio.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
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index 91c9642..87a7639 100644
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--- a/hw/virtio/virtio.c
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+++ b/hw/virtio/virtio.c
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@@ -255,6 +255,7 @@ void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len)
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{
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vq->last_avail_idx--;
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+ vq->inuse--;
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virtqueue_unmap_sg(vq, elem, len);
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}
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--
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1.8.3.1
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