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Message-Id: <20200228174630.8989-1-madhuparnabhowmik10@gmail.com>
Date: Fri, 28 Feb 2020 23:16:30 +0530
From: madhuparnabhowmik10@...il.com
To: rjw@...ysocki.net, pavel@....cz, len.brown@...el.com,
gregkh@...uxfoundation.org
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
joel@...lfernandes.org, frextrite@...il.com,
linux-kernel-mentees@...ts.linuxfoundation.org, paulmck@...nel.org,
Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Subject: [PATCH 1/2] drivers: base: power: main: Use built-in RCU list checking
From: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
This patch passes the cond argument to list_for_each_entry_rcu()
to fix the following false-positive lockdep warnings:
[ 330.302784] =============================
[ 330.302789] WARNING: suspicious RCU usage
[ 330.302796] 5.6.0-rc1+ #5 Not tainted
[ 330.302801] -----------------------------
[ 330.302808] drivers/base/power/main.c:326 RCU-list traversed in non-reader section!!
[ 330.303303] =============================
[ 330.303307] WARNING: suspicious RCU usage
[ 330.303311] 5.6.0-rc1+ #5 Not tainted
[ 330.303315] -----------------------------
[ 330.303319] drivers/base/power/main.c:1698 RCU-list traversed in non-reader section!!
[ 331.934969] =============================
[ 331.934971] WARNING: suspicious RCU usage
[ 331.934973] 5.6.0-rc1+ #5 Not tainted
[ 331.934975] -----------------------------
[ 331.934977] drivers/base/power/main.c:1238 RCU-list traversed in non-reader section!!
[ 332.467772] WARNING: suspicious RCU usage
[ 332.467775] 5.6.0-rc1+ #5 Not tainted
[ 332.467775] -----------------------------
[ 332.467778] drivers/base/power/main.c:269 RCU-list traversed in non-reader section!!
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
---
drivers/base/power/main.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 0e99a760aebd..742c05f3c1e7 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -266,7 +266,8 @@ static void dpm_wait_for_suppliers(struct device *dev, bool async)
* callbacks freeing the link objects for the links in the list we're
* walking.
*/
- list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
+ list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
+ device_links_read_lock_held())
if (READ_ONCE(link->status) != DL_STATE_DORMANT)
dpm_wait(link->supplier, async);
@@ -323,7 +324,8 @@ static void dpm_wait_for_consumers(struct device *dev, bool async)
* continue instead of trying to continue in parallel with its
* unregistration).
*/
- list_for_each_entry_rcu(link, &dev->links.consumers, s_node)
+ list_for_each_entry_rcu(link, &dev->links.consumers, s_node,
+ device_links_read_lock_held())
if (READ_ONCE(link->status) != DL_STATE_DORMANT)
dpm_wait(link->consumer, async);
@@ -1235,7 +1237,8 @@ static void dpm_superior_set_must_resume(struct device *dev)
idx = device_links_read_lock();
- list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
+ list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
+ device_links_read_lock_held())
link->supplier->power.must_resume = true;
device_links_read_unlock(idx);
@@ -1695,7 +1698,8 @@ static void dpm_clear_superiors_direct_complete(struct device *dev)
idx = device_links_read_lock();
- list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) {
+ list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
+ device_links_read_lock_held()) {
spin_lock_irq(&link->supplier->power.lock);
link->supplier->power.direct_complete = false;
spin_unlock_irq(&link->supplier->power.lock);
--
2.17.1
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