Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "K. Y. Srinivasan" Subject: [ 57/99] Drivers: hv: balloon: Do not post pressure status if interrupted Date: Fri, 2 Aug 2013 18:08:10 +0800 Message-Id: <20130802100233.980637755@linuxfoundation.org> In-Reply-To: <20130802100225.478715166@linuxfoundation.org> References: <20130802100225.478715166@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: "K. Y. Srinivasan" commit c5e2254f8d63a6654149aa32ac5f2b7dd66a976d upstream. 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 Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hv_balloon.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -975,6 +975,14 @@ static void post_status(struct hv_dynmem 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num_pages_ballooned + compute_balloon_floor(); + /* + * If our transaction ID is no longer current, just don't + * send the status.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,