From: Tiwei Bie Date: Tue, 19 Mar 2019 06:43:04 +0000 (+0800) Subject: net/virtio: fix interrupt helper for packed ring X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=c68fee95880820138a16cd2637b6de0300081dfb;p=dpdk.git net/virtio: fix interrupt helper for packed ring When disabling interrupt, the shadow event flags should also be updated accordingly. The unnecessary wmb is also dropped. Fixes: e9f4feb7e622 ("net/virtio: add packed virtqueue helpers") Cc: stable@dpdk.org Signed-off-by: Tiwei Bie Reviewed-by: Maxime Coquelin --- diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h index ca9d8e6e3c..24fa873c3c 100644 --- a/drivers/net/virtio/virtqueue.h +++ b/drivers/net/virtio/virtqueue.h @@ -321,12 +321,13 @@ vring_desc_init_split(struct vring_desc *dp, uint16_t n) static inline void virtqueue_disable_intr_packed(struct virtqueue *vq) { - uint16_t *event_flags = &vq->ring_packed.driver_event->desc_event_flags; - - *event_flags = RING_EVENT_FLAGS_DISABLE; + if (vq->event_flags_shadow != RING_EVENT_FLAGS_DISABLE) { + vq->event_flags_shadow = RING_EVENT_FLAGS_DISABLE; + vq->ring_packed.driver_event->desc_event_flags = + vq->event_flags_shadow; + } } - /** * Tell the backend not to interrupt us. */ @@ -348,7 +349,6 @@ virtqueue_enable_intr_packed(struct virtqueue *vq) uint16_t *event_flags = &vq->ring_packed.driver_event->desc_event_flags; if (vq->event_flags_shadow == RING_EVENT_FLAGS_DISABLE) { - virtio_wmb(vq->hw->weak_barriers); vq->event_flags_shadow = RING_EVENT_FLAGS_ENABLE; *event_flags = vq->event_flags_shadow; }