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hv: do not lose pending heartbeat vmbus packets 

The host keeps sending heartbeat packets independent of the
guest responding to them.  Even though we respond to the heartbeat messages at
interrupt level, we can have situations where there maybe multiple heartbeat
messages pending that have not been responded to. For instance this occurs when the
VM is paused and the host continues to send the heartbeat messages.
Address this issue by draining and responding to all
the heartbeat messages that maybe pending.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Long Li 2016-10-05 16:57:46 -07:00 committed by Greg Kroah-Hartman
parent 43605e293e
commit 407a3aee6e
1 changed files with 7 additions and 3 deletions
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10
drivers/hv/hv_util.c
View File

@ -314,10 +314,14 @@ static void heartbeat_onchannelcallback(void *context)
u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
struct icmsg_negotiate *negop = NULL;
vmbus_recvpacket(channel, hbeat_txf_buf,
PAGE_SIZE, &recvlen, &requestid);
while (1) {
vmbus_recvpacket(channel, hbeat_txf_buf,
PAGE_SIZE, &recvlen, &requestid);
if (!recvlen)
break;
if (recvlen > 0) {
icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
sizeof(struct vmbuspipe_hdr)];