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authorLong Li <longli@microsoft.com>2016-10-05 16:57:46 -0700
committerSasha Levin <alexander.levin@verizon.com>2016-11-23 22:49:10 -0500
commita9dd8df76372507ba081e9d170edd064938d7719 (patch)
treef1ada63b34571d70321b7cedaf7c520b82105c52
parentd70f2ee448d4255b63aa2739ce01cb391e602d6b (diff)
downloadlinux-linaro-stable-a9dd8df76372507ba081e9d170edd064938d7719.tar.gz
hv: do not lose pending heartbeat vmbus packets
[ Upstream commit 407a3aee6ee2d2cb46d9ba3fc380bc29f35d020c ] 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> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
-rw-r--r--drivers/hv/hv_util.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index 3b9c9ef0deb8..2d1414d07305 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)];