From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 8E168A00C3 for ; Wed, 14 Sep 2022 07:09:07 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 36B6C427F6; Wed, 14 Sep 2022 07:09:06 +0200 (CEST) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by mails.dpdk.org (Postfix) with ESMTP id 5DF7A40151; Wed, 14 Sep 2022 07:09:01 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663132141; x=1694668141; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=anzzft6slexbzIc4v7WGKL6WBmaz3E1wQMdI1qRgqm8=; b=HgwjOHQa0bO3n7uCSnhDA8NPpQ1oiN499F5rQKpqrhjxcVy8ilXxOlay bhaexu2rXCJIZo0JcFTXqcmdW4zrDnejGqGvMOeSoNQCZSuNEx0gaEkDq XBvwwWymsJzLvXL8iOlEMYKldaUmASfEMcjGgQFceFa0c8QMaNdDFjJ7v MZDOA2jIZVQ/sPSmzlSBKESTu3Xb+VWs8oRxrb3kPgI7TKIOTtDYqfkTS Wq7tbDcnXyYYP558JPH1C7A3b5crBTBZL7p7yGjI5wWiunWDF/RXxVpXf oE59XR2fjVu/5rrB/ubvnOTYZeUa/nyvWW2YOIQ23CN25zbeBB3l1L2KM g==; X-IronPort-AV: E=McAfee;i="6500,9779,10469"; a="298336379" X-IronPort-AV: E=Sophos;i="5.93,313,1654585200"; d="scan'208";a="298336379" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Sep 2022 22:09:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,313,1654585200"; d="scan'208";a="945368982" Received: from txandevlnx322.an.intel.com ([10.123.117.44]) by fmsmga005.fm.intel.com with ESMTP; 13 Sep 2022 22:09:00 -0700 From: Naga Harish K S V To: jerinj@marvell.com Cc: dev@dpdk.org, erik.g.carrillo@intel.com, pbhagavatula@marvell.com, sthotton@marvell.com, stable@dpdk.org Subject: [PATCH v5 2/4] timer: fix function to stop all timers Date: Wed, 14 Sep 2022 00:08:52 -0500 Message-Id: <20220914050855.1677489-2-s.v.naga.harish.k@intel.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20220914050855.1677489-1-s.v.naga.harish.k@intel.com> References: <20220812160714.287055-1-s.v.naga.harish.k@intel.com> <20220914050855.1677489-1-s.v.naga.harish.k@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org There is a possibility of deadlock in this API, as same spinlock is tried to be acquired in nested manner. If the lcore that is stopping the timer is different from the lcore that owns the timer, the timer list lock is acquired in timer_del(), even if local_is_locked is true. Because the same lock was already acquired in rte_timer_stop_all(), the thread will hang. This patch removes the acquisition of nested lock. Fixes: 821c51267bcd63a ("timer: add function to stop all timers in a list") Cc: stable@dpdk.org Signed-off-by: Naga Harish K S V --- lib/timer/rte_timer.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) diff --git a/lib/timer/rte_timer.c b/lib/timer/rte_timer.c index 9994813d0d..85d67573eb 100644 --- a/lib/timer/rte_timer.c +++ b/lib/timer/rte_timer.c @@ -580,7 +580,7 @@ rte_timer_reset_sync(struct rte_timer *tim, uint64_t ticks, } static int -__rte_timer_stop(struct rte_timer *tim, int local_is_locked, +__rte_timer_stop(struct rte_timer *tim, struct rte_timer_data *timer_data) { union rte_timer_status prev_status, status; @@ -602,7 +602,7 @@ __rte_timer_stop(struct rte_timer *tim, int local_is_locked, /* remove it from list */ if (prev_status.state == RTE_TIMER_PENDING) { - timer_del(tim, prev_status, local_is_locked, priv_timer); + timer_del(tim, prev_status, 0, priv_timer); __TIMER_STAT_ADD(priv_timer, pending, -1); } @@ -631,7 +631,7 @@ rte_timer_alt_stop(uint32_t timer_data_id, struct rte_timer *tim) TIMER_DATA_VALID_GET_OR_ERR_RET(timer_data_id, timer_data, -EINVAL); - return __rte_timer_stop(tim, 0, timer_data); + return __rte_timer_stop(tim, timer_data); } /* loop until rte_timer_stop() succeed */ @@ -987,21 +987,16 @@ rte_timer_stop_all(uint32_t timer_data_id, unsigned int *walk_lcores, walk_lcore = walk_lcores[i]; priv_timer = &timer_data->priv_timer[walk_lcore]; - rte_spinlock_lock(&priv_timer->list_lock); - for (tim = priv_timer->pending_head.sl_next[0]; tim != NULL; tim = next_tim) { next_tim = tim->sl_next[0]; - /* Call timer_stop with lock held */ - __rte_timer_stop(tim, 1, timer_data); + __rte_timer_stop(tim, timer_data); if (f) f(tim, f_arg); } - - rte_spinlock_unlock(&priv_timer->list_lock); } return 0; -- 2.25.1