From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754069AbaEOGM1 (ORCPT ); Thu, 15 May 2014 02:12:27 -0400 Received: from mail-pa0-f41.google.com ([209.85.220.41]:37188 "EHLO mail-pa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753848AbaEOGM0 (ORCPT ); Thu, 15 May 2014 02:12:26 -0400 X-Google-Original-From: Jassi Brar From: Jassi Brar To: linux-kernel@vger.kernel.org Cc: gregkh@linuxfoundation.org, s-anna@ti.com, loic.pallardy@st.com, lftan.linux@gmail.com, slapdau@yahoo.com.au, courtney.cavin@sonymobile.com, robherring2@gmail.com, arnd@arndb.de, joshc@codeaurora.org, linus.walleij@linaro.org, galak@codeaurora.org, ks.giri@samsung.com, Jassi Brar Subject: [PATCHv5 3/4] mailbox: Fix TX completion init Date: Thu, 15 May 2014 11:41:41 +0530 Message-Id: <1400134301-4010-1-git-send-email-jaswinder.singh@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1400134105-3847-1-git-send-email-jaswinder.singh@linaro.org> References: <1400134105-3847-1-git-send-email-jaswinder.singh@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: LeyFoon Tan For fast TX the complete could be called before being initialized as follows mbox_send_message --> poll_txdone --> tx_tick --> complete(&chan->tx_complete) Init the completion early enough to fix the race. Signed-off-by: LeyFoon Tan Signed-off-by: Jassi Brar --- drivers/mailbox/mailbox.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 921fedd3..befb256 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -245,6 +245,9 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg) if (!chan || !chan->cl) return -EINVAL; + if (chan->cl->tx_block) + init_completion(&chan->tx_complete); + t = _add_to_rbuf(chan, mssg); if (t < 0) { pr_err("Try increasing MBOX_TX_QUEUE_LEN\n"); @@ -258,7 +261,6 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg) if (chan->cl->tx_block && chan->active_req) { int ret; - init_completion(&chan->tx_complete); ret = wait_for_completion_timeout(&chan->tx_complete, chan->cl->tx_tout); if (ret == 0) { -- 1.8.1.2