From 2591e7b17c0d3f1472f9ddb2dd5922f24fc5e4d9 Mon Sep 17 00:00:00 2001 From: Madhuparna Bhowmik Date: Wed, 4 Mar 2020 01:12:09 +0530 Subject: PM: sleep: wakeup: Use built-in RCU list checking 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. (CONFIG_PROVE_RCU_LIST = y) [ 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 Signed-off-by: Rafael J. Wysocki --- drivers/base/power/wakeup.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'drivers/base') diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 27f3e60608e5..7e33a8d829dc 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -24,6 +24,9 @@ suspend_state_t pm_suspend_target_state; #define pm_suspend_target_state (PM_SUSPEND_ON) #endif +#define list_for_each_entry_rcu_locked(pos, head, member) \ + list_for_each_entry_rcu(pos, head, member, \ + srcu_read_lock_held(&wakeup_srcu)) /* * If set, the suspend/hibernate code will abort transitions to a sleep state * if wakeup events are registered during or immediately before the transition. @@ -405,7 +408,7 @@ 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_locked(ws, &wakeup_sources, entry) dev_pm_arm_wake_irq(ws->wakeirq); srcu_read_unlock(&wakeup_srcu, srcuidx); } @@ -421,7 +424,7 @@ 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_locked(ws, &wakeup_sources, entry) dev_pm_disarm_wake_irq(ws->wakeirq); srcu_read_unlock(&wakeup_srcu, srcuidx); } @@ -874,7 +877,7 @@ 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_locked(ws, &wakeup_sources, entry) { if (ws->active) { pm_pr_dbg("active wakeup source: %s\n", ws->name); active = 1; @@ -1025,7 +1028,7 @@ 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_locked(ws, &wakeup_sources, entry) { spin_lock_irq(&ws->lock); if (ws->autosleep_enabled != set) { ws->autosleep_enabled = set; @@ -1104,7 +1107,7 @@ 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_locked(ws, &wakeup_sources, entry) { if (n-- <= 0) return ws; } -- cgit v1.2.3