From patchwork Tue Nov 29 10:07:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sascha Hauer X-Patchwork-Id: 13058418 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26181C4332F for ; Tue, 29 Nov 2022 10:10:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231241AbiK2KKL (ORCPT ); Tue, 29 Nov 2022 05:10:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33806 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230385AbiK2KJW (ORCPT ); Tue, 29 Nov 2022 05:09:22 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8FCC5E9D9 for ; Tue, 29 Nov 2022 02:08:30 -0800 (PST) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ozxX1-0006yC-Mv; Tue, 29 Nov 2022 11:08:03 +0100 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1ozxWy-0012i5-GE; Tue, 29 Nov 2022 11:08:01 +0100 Received: from sha by dude02.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1ozxWx-00BYGx-EN; Tue, 29 Nov 2022 11:07:59 +0100 From: Sascha Hauer To: linux-wireless@vger.kernel.org Cc: Neo Jou , Hans Ulli Kroll , Ping-Ke Shih , Yan-Hsuan Chuang , Kalle Valo , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Blumenstingl , kernel@pengutronix.de, Johannes Berg , Alexander Hochbaum , Da Xue , Po-Hao Huang , Viktor Petrenko , Sascha Hauer Subject: [PATCH v4 04/11] wifi: rtw88: Drop h2c.lock Date: Tue, 29 Nov 2022 11:07:47 +0100 Message-Id: <20221129100754.2753237-5-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221129100754.2753237-1-s.hauer@pengutronix.de> References: <20221129100754.2753237-1-s.hauer@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-wireless@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The h2c.lock spinlock is used in rtw_fw_send_h2c_command() and rtw_fw_send_h2c_packet(). Most callers call this with rtwdev->mutex held, except from one callsite in the debugfs code. The debugfs code alone doesn't justify the extra lock, so acquire rtwdev->mutex in debugfs and drop the now unnecessary spinlock. Signed-off-by: Sascha Hauer --- drivers/net/wireless/realtek/rtw88/debug.c | 2 ++ drivers/net/wireless/realtek/rtw88/fw.c | 13 ++++--------- drivers/net/wireless/realtek/rtw88/main.c | 1 - drivers/net/wireless/realtek/rtw88/main.h | 2 -- 4 files changed, 6 insertions(+), 12 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/debug.c b/drivers/net/wireless/realtek/rtw88/debug.c index 70e19f2a1a355..f5b8a77ebc67b 100644 --- a/drivers/net/wireless/realtek/rtw88/debug.c +++ b/drivers/net/wireless/realtek/rtw88/debug.c @@ -392,7 +392,9 @@ static ssize_t rtw_debugfs_set_h2c(struct file *filp, return -EINVAL; } + mutex_lock(&rtwdev->mutex); rtw_fw_h2c_cmd_dbg(rtwdev, param); + mutex_unlock(&rtwdev->mutex); return count; } diff --git a/drivers/net/wireless/realtek/rtw88/fw.c b/drivers/net/wireless/realtek/rtw88/fw.c index 0b5f903c0f366..a58c80d4825b1 100644 --- a/drivers/net/wireless/realtek/rtw88/fw.c +++ b/drivers/net/wireless/realtek/rtw88/fw.c @@ -322,7 +322,7 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev, h2c[3], h2c[2], h2c[1], h2c[0], h2c[7], h2c[6], h2c[5], h2c[4]); - spin_lock(&rtwdev->h2c.lock); + lockdep_assert_held(&rtwdev->mutex); box = rtwdev->h2c.last_box_num; switch (box) { @@ -344,7 +344,7 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev, break; default: WARN(1, "invalid h2c mail box number\n"); - goto out; + return; } ret = read_poll_timeout_atomic(rtw_read8, box_state, @@ -353,7 +353,7 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev, if (ret) { rtw_err(rtwdev, "failed to send h2c command\n"); - goto out; + return; } for (idx = 0; idx < 4; idx++) @@ -363,9 +363,6 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev, if (++rtwdev->h2c.last_box_num >= 4) rtwdev->h2c.last_box_num = 0; - -out: - spin_unlock(&rtwdev->h2c.lock); } void rtw_fw_h2c_cmd_dbg(struct rtw_dev *rtwdev, u8 *h2c) @@ -377,15 +374,13 @@ static void rtw_fw_send_h2c_packet(struct rtw_dev *rtwdev, u8 *h2c_pkt) { int ret; - spin_lock(&rtwdev->h2c.lock); + lockdep_assert_held(&rtwdev->mutex); FW_OFFLOAD_H2C_SET_SEQ_NUM(h2c_pkt, rtwdev->h2c.seq); ret = rtw_hci_write_data_h2c(rtwdev, h2c_pkt, H2C_PKT_SIZE); if (ret) rtw_err(rtwdev, "failed to send h2c packet\n"); rtwdev->h2c.seq++; - - spin_unlock(&rtwdev->h2c.lock); } void diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c index 710ddb0283c82..c98e56890401c 100644 --- a/drivers/net/wireless/realtek/rtw88/main.c +++ b/drivers/net/wireless/realtek/rtw88/main.c @@ -2067,7 +2067,6 @@ int rtw_core_init(struct rtw_dev *rtwdev) skb_queue_head_init(&rtwdev->coex.queue); skb_queue_head_init(&rtwdev->tx_report.queue); - spin_lock_init(&rtwdev->h2c.lock); spin_lock_init(&rtwdev->txq_lock); spin_lock_init(&rtwdev->tx_report.q_lock); diff --git a/drivers/net/wireless/realtek/rtw88/main.h b/drivers/net/wireless/realtek/rtw88/main.h index f24d17f482aaa..4b57542bef1e9 100644 --- a/drivers/net/wireless/realtek/rtw88/main.h +++ b/drivers/net/wireless/realtek/rtw88/main.h @@ -2020,8 +2020,6 @@ struct rtw_dev { struct { /* incicate the mail box to use with fw */ u8 last_box_num; - /* protect to send h2c to fw */ - spinlock_t lock; u32 seq; } h2c;