From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752176AbdATNwh (ORCPT ); Fri, 20 Jan 2017 08:52:37 -0500 Received: from regular1.263xmail.com ([211.150.99.139]:44108 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751022AbdATNwf (ORCPT ); Fri, 20 Jan 2017 08:52:35 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-RL-SENDER: jeffy.chen@rock-chips.com X-FST-TO: linux-bluetooth@vger.kernel.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: jeffy.chen@rock-chips.com X-UNIQUE-TAG: <35f20ebe602961edac190c99d97409ec> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Jeffy Chen To: linux-bluetooth@vger.kernel.org Cc: Brian Norris , Douglas Anderson , Jeffy Chen , Johan Hedberg , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "David S. Miller" , Marcel Holtmann , Gustavo Padovan Subject: [PATCH] Bluetooth: hidp: might sleep error in hidp_session_thread Date: Fri, 20 Jan 2017 21:52:08 +0800 Message-Id: <1484920328-20522-1-git-send-email-jeffy.chen@rock-chips.com> X-Mailer: git-send-email 2.1.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ 39.044329] do not call blocking ops when !TASK_RUNNING; state=1 set at [] hidp_session_thread+0x110/0x568 [hidp] ... [ 40.159664] Call trace: [ 40.162122] [] __might_sleep+0x64/0x90 [ 40.167443] [] lock_sock_nested+0x30/0x78 [ 40.173047] [] l2cap_sock_sendmsg+0x90/0xf0 [bluetooth] [ 40.179842] [] sock_sendmsg+0x4c/0x68 [ 40.185072] [] kernel_sendmsg+0x54/0x68 [ 40.190477] [] hidp_send_frame+0x78/0xa0 [hidp] [ 40.196574] [] hidp_process_transmit+0x44/0x98 [hidp] [ 40.203191] [] hidp_session_thread+0x364/0x568 [hidp] Following (https://lwn.net/Articles/628628/). Signed-off-by: Jeffy Chen --- net/bluetooth/hidp/core.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c index 0bec458..bfd3fb8 100644 --- a/net/bluetooth/hidp/core.c +++ b/net/bluetooth/hidp/core.c @@ -1180,7 +1180,9 @@ static void hidp_session_run(struct hidp_session *session) struct sock *ctrl_sk = session->ctrl_sock->sk; struct sock *intr_sk = session->intr_sock->sk; struct sk_buff *skb; + DEFINE_WAIT_FUNC(wait, woken_wake_function); + add_wait_queue(sk_sleep(intr_sk), &wait); for (;;) { /* * This thread can be woken up two ways: @@ -1188,12 +1190,10 @@ static void hidp_session_run(struct hidp_session *session) * session->terminate flag and wakes this thread up. * - Via modifying the socket state of ctrl/intr_sock. This * thread is woken up by ->sk_state_changed(). - * - * Note: set_current_state() performs any necessary - * memory-barriers for us. */ - set_current_state(TASK_INTERRUPTIBLE); + /* Ensure session->terminate is updated */ + smp_mb__before_atomic(); if (atomic_read(&session->terminate)) break; @@ -1227,11 +1227,14 @@ static void hidp_session_run(struct hidp_session *session) hidp_process_transmit(session, &session->ctrl_transmit, session->ctrl_sock); - schedule(); + wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); } + remove_wait_queue(sk_sleep(intr_sk), &wait); atomic_inc(&session->terminate); - set_current_state(TASK_RUNNING); + + /* Ensure session->terminate is updated */ + smp_mb__after_atomic(); } /* -- 2.1.4