From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f49.google.com ([74.125.83.49]:33738 "EHLO mail-pg0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751575AbdHPPt4 (ORCPT ); Wed, 16 Aug 2017 11:49:56 -0400 Received: by mail-pg0-f49.google.com with SMTP id u5so24650776pgn.0 for ; Wed, 16 Aug 2017 08:49:56 -0700 (PDT) From: Stephen Hemminger To: kys@microsoft.com, decui@microsoft.com Cc: devel@linuxdriverproject.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Stephen Hemminger , John Starks Subject: [PATCH] vmbus: fix missing signaling in hv_signal_on_read() Date: Wed, 16 Aug 2017 08:49:46 -0700 Message-Id: <20170816154946.7495-1-sthemmin@microsoft.com> Sender: stable-owner@vger.kernel.org List-ID: When the space available before start of reading (cached_write_sz) is the same as the host required space (pending_sz), we need to still signal host. Fixes: 433e19cf33d3 ("Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()") Signed-off-by: John Starks Signed-off-by: Dexuan Cui Signed-off-by: Stephen Hemminger --- This patch is for 4.13 (and stable). A different fix is needed for linux-next. include/linux/hyperv.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index e09fc8290c2f..080a0797c6f3 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1515,11 +1515,11 @@ static inline void hv_signal_on_read(struct vmbus_channel *channel) cur_write_sz = hv_get_bytes_to_write(rbi); - if (cur_write_sz < pending_sz) + if (cur_write_sz <= pending_sz) return; cached_write_sz = hv_get_cached_bytes_to_write(rbi); - if (cached_write_sz < pending_sz) + if (cached_write_sz <= pending_sz) vmbus_setevent(channel); } -- 2.11.0