From patchwork Mon Apr 5 09:09:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe JAILLET X-Patchwork-Id: 416265 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8487C43462 for ; Mon, 5 Apr 2021 09:10:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 82ED0613A0 for ; Mon, 5 Apr 2021 09:10:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238728AbhDEJKx (ORCPT ); Mon, 5 Apr 2021 05:10:53 -0400 Received: from smtp13.smtpout.orange.fr ([80.12.242.135]:35756 "EHLO smtp.smtpout.orange.fr" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S239056AbhDEJJ0 (ORCPT ); Mon, 5 Apr 2021 05:09:26 -0400 Received: from localhost.localdomain ([90.126.11.170]) by mwinf5d73 with ME id ox9G2400A3g7mfN03x9HB9; Mon, 05 Apr 2021 11:09:18 +0200 X-ME-Helo: localhost.localdomain X-ME-Auth: Y2hyaXN0b3BoZS5qYWlsbGV0QHdhbmFkb28uZnI= X-ME-Date: Mon, 05 Apr 2021 11:09:18 +0200 X-ME-IP: 90.126.11.170 From: Christophe JAILLET To: Jes.Sorensen@gmail.com, kvalo@codeaurora.org, davem@davemloft.net, kuba@kernel.org Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Christophe JAILLET Subject: [PATCH] rtl8xxxu: Simplify locking of a skb list accesses Date: Mon, 5 Apr 2021 11:09:14 +0200 Message-Id: <8bcec6429615aeb498482dc7e1955ce09b456585.1617613700.git.christophe.jaillet@wanadoo.fr> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The 'c2hcmd_lock' spinlock is only used to protect some __skb_queue_tail() and __skb_dequeue() calls. Use the lock provided in the skb itself and call skb_queue_tail() and skb_dequeue(). These functions already include the correct locking. Signed-off-by: Christophe JAILLET --- drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h | 1 - drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 11 ++--------- 2 files changed, 2 insertions(+), 10 deletions(-) diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h index d6d1be4169e5..d1a566cc0c9e 100644 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h @@ -1391,7 +1391,6 @@ struct rtl8xxxu_priv { struct delayed_work ra_watchdog; struct work_struct c2hcmd_work; struct sk_buff_head c2hcmd_queue; - spinlock_t c2hcmd_lock; struct rtl8xxxu_btcoex bt_coex; struct rtl8xxxu_ra_report ra_report; }; diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c index 5cd7ef3625c5..0eba42f2a66c 100644 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c @@ -5423,7 +5423,6 @@ static void rtl8xxxu_c2hcmd_callback(struct work_struct *work) struct rtl8xxxu_priv *priv; struct rtl8723bu_c2h *c2h; struct sk_buff *skb = NULL; - unsigned long flags; u8 bt_info = 0; struct rtl8xxxu_btcoex *btcoex; struct rtl8xxxu_ra_report *rarpt; @@ -5439,9 +5438,7 @@ static void rtl8xxxu_c2hcmd_callback(struct work_struct *work) goto out; while (!skb_queue_empty(&priv->c2hcmd_queue)) { - spin_lock_irqsave(&priv->c2hcmd_lock, flags); - skb = __skb_dequeue(&priv->c2hcmd_queue); - spin_unlock_irqrestore(&priv->c2hcmd_lock, flags); + skb = skb_dequeue(&priv->c2hcmd_queue); c2h = (struct rtl8723bu_c2h *)skb->data; @@ -5499,7 +5496,6 @@ static void rtl8723bu_handle_c2h(struct rtl8xxxu_priv *priv, struct rtl8723bu_c2h *c2h = (struct rtl8723bu_c2h *)skb->data; struct device *dev = &priv->udev->dev; int len; - unsigned long flags; len = skb->len - 2; @@ -5538,9 +5534,7 @@ static void rtl8723bu_handle_c2h(struct rtl8xxxu_priv *priv, break; } - spin_lock_irqsave(&priv->c2hcmd_lock, flags); - __skb_queue_tail(&priv->c2hcmd_queue, skb); - spin_unlock_irqrestore(&priv->c2hcmd_lock, flags); + skb_queue_tail(&priv->c2hcmd_queue, skb); schedule_work(&priv->c2hcmd_work); } @@ -6606,7 +6600,6 @@ static int rtl8xxxu_probe(struct usb_interface *interface, spin_lock_init(&priv->rx_urb_lock); INIT_WORK(&priv->rx_urb_wq, rtl8xxxu_rx_urb_work); INIT_DELAYED_WORK(&priv->ra_watchdog, rtl8xxxu_watchdog_callback); - spin_lock_init(&priv->c2hcmd_lock); INIT_WORK(&priv->c2hcmd_work, rtl8xxxu_c2hcmd_callback); skb_queue_head_init(&priv->c2hcmd_queue);