From patchwork Sun Aug 7 09:49:15 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Sakamoto X-Patchwork-Id: 9266343 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 CCBA26048F for ; Sun, 7 Aug 2016 10:07:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BE14627DE0 for ; Sun, 7 Aug 2016 10:07:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B23F82808C; Sun, 7 Aug 2016 10:07:47 +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=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E8DC127DE0 for ; Sun, 7 Aug 2016 10:07:46 +0000 (UTC) Received: by alsa0.perex.cz (Postfix, from userid 1000) id 35BB52673F1; Sun, 7 Aug 2016 12:07:46 +0200 (CEST) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 5800526687B; Sun, 7 Aug 2016 11:50:22 +0200 (CEST) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 949FF266703; Sun, 7 Aug 2016 11:50:17 +0200 (CEST) Received: from smtp-proxy004.phy.lolipop.jp (smtp-proxy004.phy.lolipop.jp [157.7.104.45]) by alsa0.perex.cz (Postfix) with ESMTP id 22011265DF4 for ; Sun, 7 Aug 2016 11:49:40 +0200 (CEST) Received: from smtp-proxy004.phy.lolipop.lan (HELO smtp-proxy004.phy.lolipop.jp) (172.19.44.45) (smtp-auth username m12129643-o-takashi, mechanism plain) by smtp-proxy004.phy.lolipop.jp (qpsmtpd/0.82) with ESMTPA; Sun, 07 Aug 2016 18:49:36 +0900 Received: from 127.0.0.1 (127.0.0.1) by smtp-proxy004.phy.lolipop.jp (LOLIPOP-Fsecure); Sun, 07 Aug 2016 18:49:15 +0900 (JST) X-Virus-Status: clean(LOLIPOP-Fsecure) From: Takashi Sakamoto To: clemens@ladisch.de, tiwai@suse.de Date: Sun, 7 Aug 2016 18:49:15 +0900 Message-Id: <1470563355-18368-40-git-send-email-o-takashi@sakamocchi.jp> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1470563355-18368-1-git-send-email-o-takashi@sakamocchi.jp> References: <1470563355-18368-1-git-send-email-o-takashi@sakamocchi.jp> Cc: alsa-devel@alsa-project.org Subject: [alsa-devel] [PATCH 39/39] ALSA: seq: optimize query_next_port function to new design X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP In former commit, actual operations of each ioctl command get argument in kernel space. Copying from/to user space is performed outside of the function. This commit optimizes to the new design. Signed-off-by: Takashi Sakamoto --- sound/core/seq/seq_clientmgr.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c index 0f840ca..6bc29b5 100644 --- a/sound/core/seq/seq_clientmgr.c +++ b/sound/core/seq/seq_clientmgr.c @@ -2014,35 +2014,30 @@ static int seq_ioctl_query_next_client(struct snd_seq_client *client, void *arg) /* * query next port */ -static int seq_ioctl_query_next_port(struct snd_seq_client *client, - void __user *arg) +static int seq_ioctl_query_next_port(struct snd_seq_client *client, void *arg) { + struct snd_seq_port_info *info = arg; struct snd_seq_client *cptr; struct snd_seq_client_port *port = NULL; - struct snd_seq_port_info info; - if (copy_from_user(&info, arg, sizeof(info))) - return -EFAULT; - cptr = snd_seq_client_use_ptr(info.addr.client); + cptr = snd_seq_client_use_ptr(info->addr.client); if (cptr == NULL) return -ENXIO; /* search for next port */ - info.addr.port++; - port = snd_seq_port_query_nearest(cptr, &info); + info->addr.port++; + port = snd_seq_port_query_nearest(cptr, info); if (port == NULL) { snd_seq_client_unlock(cptr); return -ENOENT; } /* get port info */ - info.addr = port->addr; - snd_seq_get_port_info(port, &info); + info->addr = port->addr; + snd_seq_get_port_info(port, info); snd_seq_port_unlock(port); snd_seq_client_unlock(cptr); - if (copy_to_user(arg, &info, sizeof(info))) - return -EFAULT; return 0; }