tree 555bca933a49b4c0062e302d0b26f8b38b37e54e
parent 47cb14192bcbba3f15b1c3561e05e084e56fdef6
author Gerd Hoffmann <kraxel@redhat.com> 1522749544 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1525212785 -0700

drm/virtio: fix vq wait_event condition

commit d02d270014f70dcab0117776b81a37b6fca745ae upstream.

Wait until we have enough space in the virt queue to actually queue up
our request.  Avoids the guest spinning in case we have a non-zero
amount of free entries but not enough for the request.

Cc: stable@vger.kernel.org
Reported-by: Alain Magloire <amagloire@blackberry.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20180403095904.11152-1-kraxel@redhat.com
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>