[PATCH] hv: do not lose pending heartbeat vmbus packets
Long Li
longli at exchange.microsoft.com
Tue Sep 13 03:31:21 UTC 2016
From: Long Li <longli at microsoft.com>
The host keeps sending heartbeat packets independent of guest responding to them. In some situations, there might be multiple heartbeat packets pending in the ring buffer. Don't lose them, read them all.
Signed-off-by: Long Li <longli at microsoft.com>
---
drivers/hv/hv_util.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index d5acaa2..9dc6372 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -283,10 +283,14 @@ 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)];
--
1.8.5.6
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