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Message-Id: <20190712170024.111093-6-joel@joelfernandes.org>
Date: Fri, 12 Jul 2019 13:00:20 -0400
From: "Joel Fernandes (Google)" <joel@...lfernandes.org>
To: linux-kernel@...r.kernel.org
Cc: "Joel Fernandes (Google)" <joel@...lfernandes.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Borislav Petkov <bp@...en8.de>,
c0d1n61at3@...il.com,
"David S. Miller" <davem@...emloft.net>,
edumazet@...gle.com,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
"H. Peter Anvin" <hpa@...or.com>,
Ingo Molnar <mingo@...hat.com>,
Jonathan Corbet <corbet@....net>,
Josh Triplett <josh@...htriplett.org>,
keescook@...omium.org,
kernel-hardening@...ts.openwall.com,
kernel-team@...roid.com,
Lai Jiangshan <jiangshanlai@...il.com>,
Len Brown <lenb@...nel.org>,
linux-acpi@...r.kernel.org,
linux-doc@...r.kernel.org,
linux-pci@...r.kernel.org,
linux-pm@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
neilb@...e.com,
netdev@...r.kernel.org,
Oleg Nesterov <oleg@...hat.com>,
"Paul E. McKenney" <paulmck@...ux.ibm.com>,
Pavel Machek <pavel@....cz>,
peterz@...radead.org,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
rcu@...r.kernel.org,
Steven Rostedt <rostedt@...dmis.org>,
Tejun Heo <tj@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
will@...nel.org,
x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT))
Subject: [PATCH v2 5/9] driver/core: Convert to use built-in RCU list checking
list_for_each_entry_rcu has built-in RCU and lock checking. Make use of
it in driver core.
Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
drivers/base/base.h | 1 +
drivers/base/core.c | 10 ++++++++++
drivers/base/power/runtime.c | 15 ++++++++++-----
3 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/drivers/base/base.h b/drivers/base/base.h
index b405436ee28e..0d32544b6f91 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -165,6 +165,7 @@ static inline int devtmpfs_init(void) { return 0; }
/* Device links support */
extern int device_links_read_lock(void);
extern void device_links_read_unlock(int idx);
+extern int device_links_read_lock_held(void);
extern int device_links_check_suppliers(struct device *dev);
extern void device_links_driver_bound(struct device *dev);
extern void device_links_driver_cleanup(struct device *dev);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index fd7511e04e62..6c5ca9685647 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -68,6 +68,11 @@ void device_links_read_unlock(int idx)
{
srcu_read_unlock(&device_links_srcu, idx);
}
+
+int device_links_read_lock_held(void)
+{
+ return srcu_read_lock_held(&device_links_srcu);
+}
#else /* !CONFIG_SRCU */
static DECLARE_RWSEM(device_links_lock);
@@ -91,6 +96,11 @@ void device_links_read_unlock(int not_used)
{
up_read(&device_links_lock);
}
+
+int device_links_read_lock_held(void)
+{
+ return lock_is_held(&device_links_lock);
+}
#endif /* !CONFIG_SRCU */
/**
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 952a1e7057c7..7a10e8379a70 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -287,7 +287,8 @@ static int rpm_get_suppliers(struct device *dev)
{
struct device_link *link;
- 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()) {
int retval;
if (!(link->flags & DL_FLAG_PM_RUNTIME) ||
@@ -309,7 +310,8 @@ static void rpm_put_suppliers(struct device *dev)
{
struct device_link *link;
- 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_SUPPLIER_UNBIND)
continue;
@@ -1640,7 +1642,8 @@ void pm_runtime_clean_up_links(struct device *dev)
idx = device_links_read_lock();
- 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 (link->flags & DL_FLAG_STATELESS)
continue;
@@ -1662,7 +1665,8 @@ void pm_runtime_get_suppliers(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())
if (link->flags & DL_FLAG_PM_RUNTIME) {
link->supplier_preactivated = true;
refcount_inc(&link->rpm_active);
@@ -1683,7 +1687,8 @@ void pm_runtime_put_suppliers(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())
if (link->supplier_preactivated) {
link->supplier_preactivated = false;
if (refcount_dec_not_one(&link->rpm_active))
--
2.22.0.510.g264f2c817a-goog
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