Mao Wenan 05724341d9 virtio_ring: Avoid loop when vq is broken in virtqueue_poll ... [ Upstream commit 481a0d7422 ] 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>		2020-08-26 10:40:57 +02:00
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Kconfig	virtio-pmem: Add virtio pmem driver	2019-07-05 15:19:10 -07:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
virtio.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
virtio_balloon.c	virtio_balloon: fix up endian-ness for free cmd id	2020-08-05 09:59:43 +02:00
virtio_input.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
virtio_mmio.c	virtio-mmio: add error check for platform_get_irq	2019-07-11 16:22:29 -04:00
virtio_pci_common.c	virtio-pci: check name when counting MSI-X vectors	2020-02-11 04:35:43 -08:00
virtio_pci_common.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 78	2019-05-24 17:37:51 +02:00
virtio_pci_legacy.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 78	2019-05-24 17:37:51 +02:00
virtio_pci_modern.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 78	2019-05-24 17:37:51 +02:00
virtio_ring.c	virtio_ring: Avoid loop when vq is broken in virtqueue_poll	2020-08-26 10:40:57 +02:00