From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: "K. Y. Srinivasan" To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com, jasowang@redhat.com Cc: "K. Y. Srinivasan" , Stable Subject: [PATCH 2/2] Drivers: hv: balloon: Do not post pressure status if interrupted Date: Fri, 12 Jul 2013 06:56:15 -0700 Message-Id: <1373637375-25936-2-git-send-email-kys@microsoft.com> In-Reply-To: <1373637375-25936-1-git-send-email-kys@microsoft.com> References: <1373637292-25855-1-git-send-email-kys@microsoft.com> <1373637375-25936-1-git-send-email-kys@microsoft.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: When we are posting pressure status, we may get interrupted and handle the un-balloon operation. In this case just don't post the status as we know the pressure status is stale. Signed-off-by: K. Y. Srinivasan Cc: Stable --- drivers/hv/hv_balloon.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index bfc7be2..4abaccf 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -972,6 +972,14 @@ static void post_status(struct hv_dynmem_device *dm) dm->num_pages_ballooned + compute_balloon_floor(); + /* + * If our transaction ID is no longer current, just don't + * send the status. This can happen if we were interrupted + * after we picked our transaction ID. + */ + if (status.hdr.trans_id != atomic_read(&trans_id)) + return; + vmbus_sendpacket(dm->dev->channel, &status, sizeof(struct dm_status), (unsigned long)NULL, -- 1.7.4.1