Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935009AbaGXJyB (ORCPT ); Thu, 24 Jul 2014 05:54:01 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:55183 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934812AbaGXJtL (ORCPT ); Thu, 24 Jul 2014 05:49:11 -0400 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: "K. Y. Srinivasan" , Greg Kroah-Hartman , Luis Henriques Subject: [PATCH 3.11 114/128] Drivers: hv: vmbus: Fix a bug in the channel callback dispatch code Date: Thu, 24 Jul 2014 10:46:03 +0100 Message-Id: <1406195177-8656-115-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1406195177-8656-1-git-send-email-luis.henriques@canonical.com> References: <1406195177-8656-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.11 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.11.10.14 -stable review patch. If anyone has any objections, please let me know. ------------------ From: "K. Y. Srinivasan" commit affb1aff300ddee54df307812b38f166e8a865ef upstream. Starting with Win8, we have implemented several optimizations to improve the scalability and performance of the VMBUS transport between the Host and the Guest. Some of the non-performance critical services cannot leverage these optimization since they only read and process one message at a time. Make adjustments to the callback dispatch code to account for the way non-performance critical drivers handle reading of the channel. Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman Signed-off-by: Luis Henriques --- drivers/hv/connection.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index 8e8522d85509..f4ebce7a897e 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -317,9 +317,13 @@ static void process_chn_event(u32 relid) */ do { - hv_begin_read(&channel->inbound); + if (read_state) + hv_begin_read(&channel->inbound); channel->onchannel_callback(arg); - bytes_to_read = hv_end_read(&channel->inbound); + if (read_state) + bytes_to_read = hv_end_read(&channel->inbound); + else + bytes_to_read = 0; } while (read_state && (bytes_to_read != 0)); } else { pr_err("no channel callback for relid - %u\n", relid); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/