From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753341AbcIMBle (ORCPT ); Mon, 12 Sep 2016 21:41:34 -0400 Received: from p3plsmtps2ded02.prod.phx3.secureserver.net ([208.109.80.59]:36146 "EHLO p3plsmtps2ded02.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751581AbcIMBld (ORCPT ); Mon, 12 Sep 2016 21:41:33 -0400 x-originating-ip: 72.167.245.219 From: Long Li To: "K. Y. Srinivasan" , Haiyang Zhang Cc: devel@linuxdriverproject.org, linux-kernel@vger.kernel.org, Long Li Subject: [PATCH] hv: do not lose pending heartbeat vmbus packets Date: Mon, 12 Sep 2016 20:31:21 -0700 Message-Id: <1473737481-21939-1-git-send-email-longli@exchange.microsoft.com> X-Mailer: git-send-email 1.7.4.1 X-CMAE-Envelope: MS4wfAOLDDjfF+N+cPV2AZovgN5s+CpmZM0YikoyJ60NCMAws8CIrfOb46WddqNBRRUW5sxt3EwAmvlHUMQhozUSqqA5SCfcd7mweCYaPidOoZwMP+SAOkrG WKU4fmb3Uzrj8JbRw/3hFvll7U/JqQx4HiPm9y9tsKazpnCSzE9GlPyxmLKJhiJKbBTuZpWKMqMywHZ8TX+hyQs5vNoz41LP/zrpqJRkCES5t3OuIGlr0ILR TvZak2LKLqEKynwzWlmQ5wf2g1laIWKkqmNRnLfno4fsE40RLNrs99quTdT9mDGb5GDsr0+InSUQAQ/7fsfv1zWoLDJbL99MufJ69d4Ap0U= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Long Li 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 --- 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