diff options
| author | Mao Wenan <wenan.mao@linux.alibaba.com> | 2020-08-02 15:44:09 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-26 10:27:09 +0200 |
| commit | 759717b5c6cfedfadd66c36cda74bde763a36d77 (patch) | |
| tree | e55b995ddadae7f715c34de14a5820435ed1b189 /scripts/build-all.py | |
| parent | 49aae8e6f90f33858d286d93795c29a7e49b3989 (diff) | |
virtio_ring: Avoid loop when vq is broken in virtqueue_poll
[ Upstream commit 481a0d7422db26fb63e2d64f0652667a5c6d0f3e ]
The loop may exist if vq->broken is true,
virtqueue_get_buf_ctx_packed or virtqueue_get_buf_ctx_split
will return NULL, so virtnet_poll will reschedule napi to
receive packet, it will lead cpu usage(si) to 100%.
call trace as below:
virtnet_poll
virtnet_receive
virtqueue_get_buf_ctx
virtqueue_get_buf_ctx_packed
virtqueue_get_buf_ctx_split
virtqueue_napi_complete
virtqueue_poll //return true
virtqueue_napi_schedule //it will reschedule napi
to fix this, return false if vq is broken in virtqueue_poll.
Signed-off-by: Mao Wenan <wenan.mao@linux.alibaba.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/1596354249-96204-1-git-send-email-wenan.mao@linux.alibaba.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts/build-all.py')
0 files changed, 0 insertions, 0 deletions