From patchwork Fri Jun 22 21:52:59 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 10483117 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B72E960388 for ; Fri, 22 Jun 2018 21:53:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A49FC2903B for ; Fri, 22 Jun 2018 21:53:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9946729044; Fri, 22 Jun 2018 21:53:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 285552903C for ; Fri, 22 Jun 2018 21:53:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933639AbeFVVxQ (ORCPT ); Fri, 22 Jun 2018 17:53:16 -0400 Received: from esa2.hgst.iphmx.com ([68.232.143.124]:27587 "EHLO esa2.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933440AbeFVVxN (ORCPT ); Fri, 22 Jun 2018 17:53:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1529704420; x=1561240420; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=B63jGmW147zaOMjq5yv3SzESHdfVCZ/4EU/3diMR8BQ=; b=jtX1oT1/Ua0sxCjpBSJF5QCOItcjLnA9BzIDNXtR0poupBye+p770PMs 6HXgvtvd0qYRFsLJ+TFzBpeyn40pXTxqWKZ7yPhnUcR/wuGeSWHCCecH1 yaGIwvh2u/f8qTz9IqUSAyDk0/ESPkShq7IMWv8daf3opkoI5SYmN8jEE xUzpFkC7ViEQBRipMXVOmtBelnXFA+CozvmG39e9ot+lc2S6xyNDRS1bb J8y5NmDu5+LKqSraJ3eOd/jq3IqSphfWoe3WpOLipox4xkVdeEHTLdEiW zWhKy/cta78Y1k6QXwMV/XxA7xerR146YXvK4ZP+bdgz7YnMxmZ/tTyPY w==; X-IronPort-AV: E=Sophos;i="5.51,259,1526313600"; d="scan'208";a="178351006" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 23 Jun 2018 05:53:36 +0800 Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep01.wdc.com with ESMTP; 22 Jun 2018 14:42:57 -0700 Received: from thinkpad-bart.sdcorp.global.sandisk.com ([10.111.67.248]) by uls-op-cesaip01.wdc.com with ESMTP; 22 Jun 2018 14:53:11 -0700 From: Bart Van Assche To: "Martin K . Petersen" Cc: Christoph Hellwig , target-devel@vger.kernel.org, Bart Van Assche , Hannes Reinecke Subject: [PATCH 12/20] target: Simplify the code for waiting for command completion Date: Fri, 22 Jun 2018 14:52:59 -0700 Message-Id: <20180622215307.8758-13-bart.vanassche@wdc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180622215307.8758-1-bart.vanassche@wdc.com> References: <20180622215307.8758-1-bart.vanassche@wdc.com> Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Instead of embedding the completion that is used for waiting for command completion in struct se_cmd, let the context that waits for command completion allocate it. This makes it possible to have a single code path for non-aborted and aborted commands in target_release_cmd_kref() and avoids that transport_generic_free_cmd() has to call cmd->se_tfo->release_cmd() directly. This patch does not change any functionality. Note: transport_generic_free_cmd() only waits until the se_cmd reference count has reached zero after it has set both CMD_T_FABRIC_STOP and CMD_T_ABORTED. Signed-off-by: Bart Van Assche Reviewed-by: Mike Christie Cc: Hannes Reinecke Cc: Christoph Hellwig --- drivers/target/target_core_transport.c | 24 ++++++++---------------- include/target/target_core_base.h | 2 +- 2 files changed, 9 insertions(+), 17 deletions(-) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index ebd54fc1f13a..cb48dbc2c9ba 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1309,7 +1309,7 @@ void transport_init_se_cmd( INIT_LIST_HEAD(&cmd->se_cmd_list); INIT_LIST_HEAD(&cmd->state_list); init_completion(&cmd->t_transport_stop_comp); - init_completion(&cmd->cmd_wait_comp); + cmd->compl = NULL; spin_lock_init(&cmd->t_state_lock); INIT_WORK(&cmd->work, NULL); kref_init(&cmd->cmd_kref); @@ -2658,6 +2658,7 @@ static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas) */ int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) { + DECLARE_COMPLETION_ONSTACK(compl); int ret = 0; bool aborted = false, tas = false; @@ -2676,12 +2677,13 @@ int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) if (cmd->se_lun) transport_lun_remove_cmd(cmd); } + if (aborted) + cmd->compl = &compl; if (!aborted || tas) ret = target_put_sess_cmd(cmd); if (aborted) { pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag); - wait_for_completion(&cmd->cmd_wait_comp); - cmd->se_tfo->release_cmd(cmd); + wait_for_completion(&compl); ret = 1; } return ret; @@ -2742,31 +2744,21 @@ static void target_release_cmd_kref(struct kref *kref) { struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); struct se_session *se_sess = se_cmd->se_sess; + struct completion *compl = se_cmd->compl; unsigned long flags; - bool fabric_stop; if (se_sess) { spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); list_del_init(&se_cmd->se_cmd_list); if (list_empty(&se_sess->sess_cmd_list)) wake_up(&se_sess->cmd_list_wq); - - spin_lock(&se_cmd->t_state_lock); - fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) && - (se_cmd->transport_state & CMD_T_ABORTED); - spin_unlock(&se_cmd->t_state_lock); - - if (fabric_stop) { - spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); - target_free_cmd_mem(se_cmd); - complete(&se_cmd->cmd_wait_comp); - return; - } spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); } target_free_cmd_mem(se_cmd); se_cmd->se_tfo->release_cmd(se_cmd); + if (compl) + complete(compl); } /** diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 906c1fc485e4..ca59e065c1fd 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -475,7 +475,7 @@ struct se_cmd { struct se_session *se_sess; struct se_tmr_req *se_tmr_req; struct list_head se_cmd_list; - struct completion cmd_wait_comp; + struct completion *compl; const struct target_core_fabric_ops *se_tfo; sense_reason_t (*execute_cmd)(struct se_cmd *); sense_reason_t (*transport_complete_callback)(struct se_cmd *, bool, int *);