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| author | Michael S. Tsirkin <mst@redhat.com> | 2017-10-26 03:48:01 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2018-01-31 00:47:35 +0100 |
| commit | f229a55c31a7e12a15c7b4dcf9a97a9bf7a72ce8 (patch) | |
| tree | d1a66cb14384c15dceaf6c291a34e6e4d288086d /tools/virtio/ringtest/ring.c | |
| parent | virtio: virtio_mmio: make of_device_ids const. (diff) | |
| download | linux-f229a55c31a7e12a15c7b4dcf9a97a9bf7a72ce8.tar.xz linux-f229a55c31a7e12a15c7b4dcf9a97a9bf7a72ce8.zip | |
virtio/ringtest: fix up need_event math
last kicked event index must be updated unconditionally:
even if we don't need to kick, we do not want to re-check
the same entry for events.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'tools/virtio/ringtest/ring.c')
| -rw-r--r-- | tools/virtio/ringtest/ring.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/tools/virtio/ringtest/ring.c b/tools/virtio/ringtest/ring.c index 747c5dd47be8..2b9859beea65 100644 --- a/tools/virtio/ringtest/ring.c +++ b/tools/virtio/ringtest/ring.c @@ -188,16 +188,18 @@ bool enable_call() void kick_available(void) { + bool need; + /* Flush in previous flags write */ /* Barrier C (for pairing) */ smp_mb(); - if (!need_event(event->kick_index, - guest.avail_idx, - guest.kicked_avail_idx)) - return; + need = need_event(event->kick_index, + guest.avail_idx, + guest.kicked_avail_idx); guest.kicked_avail_idx = guest.avail_idx; - kick(); + if (need) + kick(); } /* host side */ @@ -253,14 +255,18 @@ bool use_buf(unsigned *lenp, void **bufp) void call_used(void) { + bool need; + /* Flush in previous flags write */ /* Barrier D (for pairing) */ smp_mb(); - if (!need_event(event->call_index, + + need = need_event(event->call_index, host.used_idx, - host.called_used_idx)) - return; + host.called_used_idx); host.called_used_idx = host.used_idx; - call(); + + if (need) + call(); } |