From: madhuparnabhowmik10@gmail.com To: rjw@rjwysocki.net, pavel@ucw.cz, len.brown@intel.com, gregkh@linuxfoundation.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, joel@joelfernandes.org, frextrite@gmail.com, linux-kernel-mentees@lists.linuxfoundation.org, paulmck@kernel.org, Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> Subject: [PATCH 2/2] drivers: base: power: wakeup.c: Use built-in RCU list checking Date: Fri, 28 Feb 2020 23:17:45 +0530 [thread overview] Message-ID: <20200228174745.9308-1-madhuparnabhowmik10@gmail.com> (raw) From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> Pass cond argument to list_for_each_entry_rcu() to fix the following false positive lockdep warning and other uses of list_for_each_entry_rcu() in wakeup.c. [ 331.934648] ============================= [ 331.934650] WARNING: suspicious RCU usage [ 331.934653] 5.6.0-rc1+ #5 Not tainted [ 331.934655] ----------------------------- [ 331.934657] drivers/base/power/wakeup.c:408 RCU-list traversed in non-reader section!! [ 333.025156] ============================= [ 333.025161] WARNING: suspicious RCU usage [ 333.025168] 5.6.0-rc1+ #5 Not tainted [ 333.025173] ----------------------------- [ 333.025180] drivers/base/power/wakeup.c:424 RCU-list traversed in non-reader section!! Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> --- drivers/base/power/wakeup.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 27f3e60608e5..d9fefc65ac34 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -405,7 +405,8 @@ void device_wakeup_arm_wake_irqs(void) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) dev_pm_arm_wake_irq(ws->wakeirq); srcu_read_unlock(&wakeup_srcu, srcuidx); } @@ -421,7 +422,8 @@ void device_wakeup_disarm_wake_irqs(void) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) dev_pm_disarm_wake_irq(ws->wakeirq); srcu_read_unlock(&wakeup_srcu, srcuidx); } @@ -874,7 +876,8 @@ void pm_print_active_wakeup_sources(void) struct wakeup_source *last_activity_ws = NULL; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) { if (ws->active) { pm_pr_dbg("active wakeup source: %s\n", ws->name); active = 1; @@ -1025,7 +1028,8 @@ void pm_wakep_autosleep_enabled(bool set) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) { spin_lock_irq(&ws->lock); if (ws->autosleep_enabled != set) { ws->autosleep_enabled = set; @@ -1104,7 +1108,8 @@ static void *wakeup_sources_stats_seq_start(struct seq_file *m, } *srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) { if (n-- <= 0) return ws; } -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: madhuparnabhowmik10@gmail.com To: rjw@rjwysocki.net, pavel@ucw.cz, len.brown@intel.com, gregkh@linuxfoundation.org Cc: paulmck@kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>, joel@joelfernandes.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: [Linux-kernel-mentees] [PATCH 2/2] drivers: base: power: wakeup.c: Use built-in RCU list checking Date: Fri, 28 Feb 2020 23:17:45 +0530 [thread overview] Message-ID: <20200228174745.9308-1-madhuparnabhowmik10@gmail.com> (raw) From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> Pass cond argument to list_for_each_entry_rcu() to fix the following false positive lockdep warning and other uses of list_for_each_entry_rcu() in wakeup.c. [ 331.934648] ============================= [ 331.934650] WARNING: suspicious RCU usage [ 331.934653] 5.6.0-rc1+ #5 Not tainted [ 331.934655] ----------------------------- [ 331.934657] drivers/base/power/wakeup.c:408 RCU-list traversed in non-reader section!! [ 333.025156] ============================= [ 333.025161] WARNING: suspicious RCU usage [ 333.025168] 5.6.0-rc1+ #5 Not tainted [ 333.025173] ----------------------------- [ 333.025180] drivers/base/power/wakeup.c:424 RCU-list traversed in non-reader section!! Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> --- drivers/base/power/wakeup.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 27f3e60608e5..d9fefc65ac34 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -405,7 +405,8 @@ void device_wakeup_arm_wake_irqs(void) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) dev_pm_arm_wake_irq(ws->wakeirq); srcu_read_unlock(&wakeup_srcu, srcuidx); } @@ -421,7 +422,8 @@ void device_wakeup_disarm_wake_irqs(void) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) dev_pm_disarm_wake_irq(ws->wakeirq); srcu_read_unlock(&wakeup_srcu, srcuidx); } @@ -874,7 +876,8 @@ void pm_print_active_wakeup_sources(void) struct wakeup_source *last_activity_ws = NULL; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) { if (ws->active) { pm_pr_dbg("active wakeup source: %s\n", ws->name); active = 1; @@ -1025,7 +1028,8 @@ void pm_wakep_autosleep_enabled(bool set) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) { spin_lock_irq(&ws->lock); if (ws->autosleep_enabled != set) { ws->autosleep_enabled = set; @@ -1104,7 +1108,8 @@ static void *wakeup_sources_stats_seq_start(struct seq_file *m, } *srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu(ws, &wakeup_sources, entry, + srcu_read_lock_held(&wakeup_srcu)) { if (n-- <= 0) return ws; } -- 2.17.1 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees
next reply other threads:[~2020-02-28 17:47 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-28 17:47 madhuparnabhowmik10 [this message] 2020-02-28 17:47 ` [Linux-kernel-mentees] [PATCH 2/2] drivers: base: power: wakeup.c: Use built-in RCU list checking madhuparnabhowmik10 2020-03-03 19:42 madhuparnabhowmik10
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