From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752547AbdHIUiu (ORCPT ); Wed, 9 Aug 2017 16:38:50 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:43118 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752517AbdHIUip (ORCPT ); Wed, 9 Aug 2017 16:38:45 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sudeep Holla , Jassi Brar , Amit Pundir Subject: [PATCH 3.18 23/92] mailbox: handle empty message in tx_tick Date: Wed, 9 Aug 2017 13:36:51 -0700 Message-Id: <20170809202156.447372937@linuxfoundation.org> X-Mailer: git-send-email 2.14.0 In-Reply-To: <20170809202155.435709888@linuxfoundation.org> References: <20170809202155.435709888@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sudeep Holla commit cb710ab1d8a23f68ff8f45aedf3e552bb90e70de upstream. We already check if the message is empty before calling the client tx_done callback. Calling completion on a wait event is also invalid if the message is empty. This patch moves the existing empty message check earlier. Fixes: 2b6d83e2b8b7 ("mailbox: Introduce framework for mailbox") Signed-off-by: Sudeep Holla Signed-off-by: Jassi Brar Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- drivers/mailbox/mailbox.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -99,8 +99,11 @@ static void tx_tick(struct mbox_chan *ch /* Submit next message */ msg_submit(chan); + if (!mssg) + return; + /* Notify the client */ - if (mssg && chan->cl->tx_done) + if (chan->cl->tx_done) chan->cl->tx_done(chan->cl, mssg, r); if (r != -ETIME && chan->cl->tx_block)