diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2016-02-26 15:13:18 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-01 16:57:20 -0800 |
| commit | d452ab7b4c65dfcaee88a0d6866eeeb98a3d1884 (patch) | |
| tree | ea442d4397fab07eee2c31d5a12a49628298fc21 /drivers | |
| parent | 0f70b66975ce4331e9002b792d5aa6787a110181 (diff) | |
| download | linux-d452ab7b4c65dfcaee88a0d6866eeeb98a3d1884.tar.bz2 | |
Drivers: hv: vmbus: avoid unneeded compiler optimizations in vmbus_wait_for_unload()
Message header is modified by the hypervisor and we read it in a loop,
we need to prevent compilers from optimizing accesses. There are no such
optimizations at this moment, this is just a future proof.
Suggested-by: Radim Krcmar <rkrcmar@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Radim Kr.má<rkrcmar@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index 73a17be1f340..38b682bab85a 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -605,7 +605,7 @@ static void vmbus_wait_for_unload(void) bool unloaded = false; while (1) { - if (msg->header.message_type == HVMSG_NONE) { + if (READ_ONCE(msg->header.message_type) == HVMSG_NONE) { mdelay(10); continue; } |