From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753886AbdHEANc (ORCPT ); Fri, 4 Aug 2017 20:13:32 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:46440 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753019AbdHDXR2 (ORCPT ); Fri, 4 Aug 2017 19:17:28 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexey Klimov , Sudeep Holla , Jassi Brar , Amit Pundir Subject: [PATCH 4.9 033/105] mailbox: always wait in mbox_send_message for blocking Tx mode Date: Fri, 4 Aug 2017 16:15:01 -0700 Message-Id: <20170804231553.893302385@linuxfoundation.org> X-Mailer: git-send-email 2.13.4 In-Reply-To: <20170804231551.544678194@linuxfoundation.org> References: <20170804231551.544678194@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 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sudeep Holla commit c61b781ee084e69855477d23dd33e7e6caad652c upstream. There exists a race when msg_submit return immediately as there was an active request being processed which may have completed just before it's checked again in mbox_send_message. This will result in return to the caller without waiting in mbox_send_message even when it's blocking Tx. This patch fixes the issue by waiting for the completion always if Tx is in blocking mode. Fixes: 2b6d83e2b8b7 ("mailbox: Introduce framework for mailbox") Reported-by: Alexey Klimov Signed-off-by: Sudeep Holla Reviewed-by: Alexey Klimov Signed-off-by: Jassi Brar Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- drivers/mailbox/mailbox.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -261,7 +261,7 @@ int mbox_send_message(struct mbox_chan * msg_submit(chan); - if (chan->cl->tx_block && chan->active_req) { + if (chan->cl->tx_block) { unsigned long wait; int ret;