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Mon, 15 Sep 2025 21:49:19 -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 , Johannes Berg , pengdonglin Subject: [PATCH v3 10/14] wifi: mac80211: Remove redundant rcu_read_lock/unlock() in spin_lock Date: Tue, 16 Sep 2025 12:47:31 +0800 Message-Id: <20250916044735.2316171-11-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: Johannes Berg Signed-off-by: pengdonglin Signed-off-by: pengdonglin --- net/mac80211/cfg.c | 2 -- net/mac80211/debugfs.c | 2 -- net/mac80211/debugfs_netdev.c | 2 -- net/mac80211/debugfs_sta.c | 2 -- net/mac80211/sta_info.c | 2 -- 5 files changed, 10 deletions(-) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 2ed07fa121ab..4fe50d4c461d 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -4825,7 +4825,6 @@ static int ieee80211_get_txq_stats(struct wiphy *wiph= y, int ret =3D 0; =20 spin_lock_bh(&local->fq.lock); - rcu_read_lock(); =20 if (wdev) { sdata =3D IEEE80211_WDEV_TO_SUB_IF(wdev); @@ -4851,7 +4850,6 @@ static int ieee80211_get_txq_stats(struct wiphy *wiph= y, } =20 out: - rcu_read_unlock(); spin_unlock_bh(&local->fq.lock); =20 return ret; diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c index e8b78ec682da..82099f4cedbe 100644 --- a/net/mac80211/debugfs.c +++ b/net/mac80211/debugfs.c @@ -82,7 +82,6 @@ static ssize_t aqm_read(struct file *file, int len =3D 0; =20 spin_lock_bh(&local->fq.lock); - rcu_read_lock(); =20 len =3D scnprintf(buf, sizeof(buf), "access name value\n" @@ -105,7 +104,6 @@ static ssize_t aqm_read(struct file *file, fq->limit, fq->quantum); =20 - rcu_read_unlock(); spin_unlock_bh(&local->fq.lock); =20 return simple_read_from_buffer(user_buf, count, ppos, diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c index 1dac78271045..30a5a978a678 100644 --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -625,7 +625,6 @@ static ssize_t ieee80211_if_fmt_aqm( txqi =3D to_txq_info(sdata->vif.txq); =20 spin_lock_bh(&local->fq.lock); - rcu_read_lock(); =20 len =3D scnprintf(buf, buflen, @@ -642,7 +641,6 @@ static ssize_t ieee80211_if_fmt_aqm( txqi->tin.tx_bytes, txqi->tin.tx_packets); =20 - rcu_read_unlock(); spin_unlock_bh(&local->fq.lock); =20 return len; diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c index 49061bd4151b..ef75255d47d5 100644 --- a/net/mac80211/debugfs_sta.c +++ b/net/mac80211/debugfs_sta.c @@ -148,7 +148,6 @@ static ssize_t sta_aqm_read(struct file *file, char __u= ser *userbuf, return -ENOMEM; =20 spin_lock_bh(&local->fq.lock); - rcu_read_lock(); =20 p +=3D scnprintf(p, bufsz + buf - p, @@ -178,7 +177,6 @@ static ssize_t sta_aqm_read(struct file *file, char __u= ser *userbuf, test_bit(IEEE80211_TXQ_DIRTY, &txqi->flags) ? " DIRTY" : ""); } =20 - rcu_read_unlock(); spin_unlock_bh(&local->fq.lock); =20 rv =3D simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index 8c550aab9bdc..663318a75d7f 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -2637,13 +2637,11 @@ static void sta_set_tidstats(struct sta_info *sta, =20 if (link_id < 0 && tid < IEEE80211_NUM_TIDS) { spin_lock_bh(&local->fq.lock); - rcu_read_lock(); =20 tidstats->filled |=3D BIT(NL80211_TID_STATS_TXQ_STATS); ieee80211_fill_txq_stats(&tidstats->txq_stats, to_txq_info(sta->sta.txq[tid])); =20 - rcu_read_unlock(); spin_unlock_bh(&local->fq.lock); } } --=20 2.34.1