diff options
| author | sephe <sephe@FreeBSD.org> | 2016-02-29 04:58:40 +0000 |
|---|---|---|
| committer | sephe <sephe@FreeBSD.org> | 2016-02-29 04:58:40 +0000 |
| commit | 77e3b4f157e3cdacd1a05938fff6478f8da56d35 (patch) | |
| tree | fed0a85092cc95983abd67cde600a2ba0e0c1e72 | |
| parent | 42ad3cdf96a6615807695d4ea1124c7368acaa3e (diff) | |
| download | FreeBSD-src-77e3b4f157e3cdacd1a05938fff6478f8da56d35.zip FreeBSD-src-77e3b4f157e3cdacd1a05938fff6478f8da56d35.tar.gz | |
hyperv: Use proper fence function to keep store-load order for msgs
sfence only makes sure about the store-store order, which is not
sufficient here. Use atomic_thread_fence_seq_cst() as suggested
jhb and kib (a locked op in the nutshell, which should have the
Reviewed by: jhb, kib, Jun Su <junsu microsoft com>
MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D5436
| -rw-r--r-- | sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c b/sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c index 8a1e412..4895f71 100644 --- a/sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c +++ b/sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c @@ -117,7 +117,7 @@ handled: * not deliver any more messages * since there is no empty slot */ - wmb(); + atomic_thread_fence_seq_cst(); if (msg->header.message_flags.u.message_pending) { /* @@ -187,7 +187,7 @@ hv_vmbus_isr(struct trapframe *frame) * not deliver any more messages * since there is no empty slot */ - wmb(); + atomic_thread_fence_seq_cst(); if (msg->header.message_flags.u.message_pending) { /* |
