From nobody Thu Oct 2 15:16:47 2025 Received: from mail-pl1-f175.google.com (mail-pl1-f175.google.com [209.85.214.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F01EA2F1FCD for ; Tue, 16 Sep 2025 04:49:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.175 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757998190; cv=none; b=THtl52b3NTxTh0RX+CtTN5Cg6pnX/D60MhfhZsILQgh6zP2ZI7HK+VjU+GVv9GkaMSNbeGWvcn/CkMIASYWJUSPIwyIjKgkisL/VEqVq9fSf6J4yLu6xx07q+zXwrgsDBGL77H0vbAgZGJ45VWlNlchVD/fPOFk3oj7SdpaSr5c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757998190; c=relaxed/simple; bh=slyVnZPzDDOXEcpF4QZOR3I7YB3yd3f7Gxtzb+FU87Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=GgBA8tfsbPyJu+OFl77283+dFoEmNxRA6/CxBwN1VEXb60i4kx4Su6wFAcZoZBY5yfxD6q1lotuYaYnbto+3/wiSNsK5pGoX7Wc1jTOXUY+G8G3Up23RER98nntYtImbfjq8drphQO5QFYlUZ+FkvMde/6tswxiRdlowXM8XBhk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=JL+Xia8W; arc=none smtp.client-ip=209.85.214.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JL+Xia8W" Received: by mail-pl1-f175.google.com with SMTP id d9443c01a7336-266fa7a0552so15568315ad.3 for ; Mon, 15 Sep 2025 21:49:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757998187; x=1758602987; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=OlYXyo2uZuFo7JhGyy9UUCXJlKeDR2CbpPIjqr5RgpE=; b=JL+Xia8W4uyroTDLgoFXQGcvga86g7+1VEKz2roIDSxQwxKuGGI1kJw0E5mRvO2QSO m/1WcvkXEpAacTm9jy5S7c5V4Dczrr3meBJOyddNip27HVCCCOgthvtb5FLtkxbvF41s iGlUzzPGymDg3T5amMQJm6PDCBR7n+L0ahtyEay0NJYWIu7m2vFg6tr2ajT32yaanfBd xDtJu+c4X/3CeTjTCyDCOh+jJ9IMVyUrOd4EWhGGuGTa3TWSp3+no8CtHQqAuwI3rWWA BuIdQSsCM/Xgm1YsJeGbAazZkNWV/RcrZ3PBFtpntXLtYH4Vrd8FCoda8o0sXcMxI94o +OOQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757998187; x=1758602987; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=OlYXyo2uZuFo7JhGyy9UUCXJlKeDR2CbpPIjqr5RgpE=; b=TH7G8B6U7ReA60uWXN6r2HXpQR8ShUvEP5vIZ+n8XfNjlKXiuyVgEFIBmRa3oP/9Tr VVmQ0L/6YLvl5KjArGq4C4hU+MLZiPSiVJCrisUG5iegnUKYaOO4Vv6jV3939/RmyI2A 5oL8BwRueTTT2XcytBo5epvWrWYt5ZtbUB0k7/ji7kLqgP5RTHW2lRDnTTs5Mwtzt+xO duQwYpzc7ZXuNuxaZzrI8Nd1d3kpAyWKyq69Owj92ey5xQIGW1t8LeB+MbXnES4a7tLN jQPMpNhXuP2N1dutUDmeTaiW5E7vORw9jtsbngDVQOn+W+edZJqZi1w8YiWYqgJDeCH8 8PsQ== X-Forwarded-Encrypted: i=1; AJvYcCUvJ3xBTrE/wb4TFIUaaRFWitom+y6KQeT8W3tiFsKX/ng2G/iXYNchEtvsuYX3z5HB2037H1b8Oos8tKc=@vger.kernel.org X-Gm-Message-State: AOJu0YzByT1VRN0uheubmlkzFQ11IdS70mKX9JPTjLM+kLLSEcQE6Pq8 cC/RFHBEwal+Rd8Ko5+j08qkSrWqyiwHtesdk4rIsYqYB4SBIN6CxVCK X-Gm-Gg: ASbGncvldETnHmji1qpMeVen+ZBHIL/zZhRoJqsxzswPjReV689iVwWuF03/CduV7jD ak+9CgMNjSo6Hq6M4zNLQF0Rz5xAKXHYreR4moMYO/hH2caRriX0UtErPaGf8BhGNW6rooxXaDr Lb/LL67Gcm1Lvb3dOq7ffppHuJEYaNsFPEU/NPORmBc0YXJr8Q9QMgs8f/A+7x60XZmWyQCAhGK aRC2+PJR2xIib8ozRwU9BjHSpRA9OiDZf8t0ZzQM7u4BVTWMOoOFqK9W3HwQ6MuJHiRD6667bwU slrSCaKxSdQ2NpOI0xMi/kkRYxy5ZaFhjR4/bduKoV3vmayfSemWUw9gsWUpJdhwOxWBCytHTLT phf5sz24i9Rt0A9lOrf0iB4pqh7AInii7CTg2LQblklcvxP5pEg== X-Google-Smtp-Source: AGHT+IFV4zbzh4iycIfH4WDU92suC0bCanMglT0Ogl2GwpwL8kM68NHrYSygkh1AIkIcAzvJhqwslA== X-Received: by 2002:a17:903:2f4f:b0:24c:99bd:52bb with SMTP id d9443c01a7336-25d267641camr179941415ad.30.1757998187203; Mon, 15 Sep 2025 21:49:47 -0700 (PDT) Received: from pengdl-pc.mioffice.cn ([43.224.245.249]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-25ef09c77f8sm104600605ad.15.2025.09.15.21.49.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Sep 2025 21:49:46 -0700 (PDT) From: pengdonglin To: tj@kernel.org, tony.luck@intel.com, jani.nikula@linux.intel.com, ap420073@gmail.com, jv@jvosburgh.net, freude@linux.ibm.com, bcrl@kvack.org, trondmy@kernel.org, longman@redhat.com, kees@kernel.org Cc: bigeasy@linutronix.de, hdanton@sina.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-nfs@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, netdev@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-wireless@vger.kernel.org, linux-acpi@vger.kernel.org, linux-s390@vger.kernel.org, cgroups@vger.kernel.org, pengdonglin , "Toke" , Jakub Kicinski , pengdonglin Subject: [PATCH v3 14/14] wifi: ath9k: Remove redundant rcu_read_lock/unlock() in spin_lock Date: Tue, 16 Sep 2025 12:47:35 +0800 Message-Id: <20250916044735.2316171-15-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250916044735.2316171-1-dolinux.peng@gmail.com> References: <20250916044735.2316171-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: pengdonglin Since commit a8bb74acd8efe ("rcu: Consolidate RCU-sched update-side functio= n definitions") there is no difference between rcu_read_lock(), rcu_read_lock_bh() and rcu_read_lock_sched() in terms of RCU read section and the relevant grace period. That means that spin_lock(), which implies rcu_read_lock_sched(), also implies rcu_read_lock(). There is no need no explicitly start a RCU read section if one has already been started implicitly by spin_lock(). Simplify the code and remove the inner rcu_read_lock() invocation. Cc: "Toke" Cc: Jakub Kicinski Signed-off-by: pengdonglin Signed-off-by: pengdonglin --- drivers/net/wireless/ath/ath9k/xmit.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/a= th/ath9k/xmit.c index 0ac9212e42f7..4a0f465aa2fe 100644 --- a/drivers/net/wireless/ath/ath9k/xmit.c +++ b/drivers/net/wireless/ath/ath9k/xmit.c @@ -1993,7 +1993,6 @@ void ath_txq_schedule(struct ath_softc *sc, struct at= h_txq *txq) =20 ieee80211_txq_schedule_start(hw, txq->mac80211_qnum); spin_lock_bh(&sc->chan_lock); - rcu_read_lock(); =20 if (sc->cur_chan->stopped) goto out; @@ -2011,7 +2010,6 @@ void ath_txq_schedule(struct ath_softc *sc, struct at= h_txq *txq) } =20 out: - rcu_read_unlock(); spin_unlock_bh(&sc->chan_lock); ieee80211_txq_schedule_end(hw, txq->mac80211_qnum); } --=20 2.34.1