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Message-ID: <20111204200248.25620.20660.stgit@srivatsabhat.in.ibm.com>
Date: Mon, 05 Dec 2011 01:33:22 +0530
From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To: rjw@...k.pl
Cc: pavel@....cz, len.brown@...el.com, ebiederm@...ssion.com,
tj@...nel.org, rdunlap@...otime.net, linux-doc@...r.kernel.org,
kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: [PATCH 2/3] PM / Sleep: Replace mutex_[un]lock(&pm_mutex) with
[un]lock_system_sleep()
Using [un]lock_system_sleep() is safer than directly using mutex_[un]lock()
on 'pm_mutex', since the latter could lead to freezing failures. Hence convert
all the present users of mutex_[un]lock(&pm_mutex) to use these safe APIs
instead.
Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---
kernel/kexec.c | 4 ++--
kernel/power/hibernate.c | 16 ++++++++--------
kernel/power/main.c | 4 ++--
kernel/power/suspend.c | 4 ++--
kernel/power/user.c | 16 ++++++++--------
5 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index dc7bc08..090ee10 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1523,7 +1523,7 @@ int kernel_kexec(void)
#ifdef CONFIG_KEXEC_JUMP
if (kexec_image->preserve_context) {
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
pm_prepare_console();
error = freeze_processes();
if (error) {
@@ -1576,7 +1576,7 @@ int kernel_kexec(void)
thaw_processes();
Restore_console:
pm_restore_console();
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
}
#endif
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 605149a..6d6d288 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -69,14 +69,14 @@ void hibernation_set_ops(const struct platform_hibernation_ops *ops)
WARN_ON(1);
return;
}
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
hibernation_ops = ops;
if (ops)
hibernation_mode = HIBERNATION_PLATFORM;
else if (hibernation_mode == HIBERNATION_PLATFORM)
hibernation_mode = HIBERNATION_SHUTDOWN;
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
}
static bool entering_platform_hibernation;
@@ -597,7 +597,7 @@ int hibernate(void)
{
int error;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
/* The snapshot device should not be opened while we're running */
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
error = -EBUSY;
@@ -665,7 +665,7 @@ int hibernate(void)
pm_restore_console();
atomic_inc(&snapshot_device_available);
Unlock:
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return error;
}
@@ -893,7 +893,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
if (len == strlen(hibernation_modes[i])
&& !strncmp(buf, hibernation_modes[i], len)) {
@@ -919,7 +919,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
if (!error)
pr_debug("PM: Hibernation mode set to '%s'\n",
hibernation_modes[mode]);
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return error ? error : n;
}
@@ -946,9 +946,9 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
if (maj != MAJOR(res) || min != MINOR(res))
goto out;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
swsusp_resume_device = res;
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
printk(KERN_INFO "PM: Starting manual resume from disk\n");
noresume = 0;
software_resume();
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 7d36fb3..9824b41e 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -116,7 +116,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
level = TEST_FIRST;
for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
@@ -126,7 +126,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
break;
}
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return error ? error : n;
}
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index d336b27..4fd51be 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -42,9 +42,9 @@ static const struct platform_suspend_ops *suspend_ops;
*/
void suspend_set_ops(const struct platform_suspend_ops *ops)
{
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
suspend_ops = ops;
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
}
EXPORT_SYMBOL_GPL(suspend_set_ops);
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 06ea33d..98ade21 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -71,7 +71,7 @@ static int snapshot_open(struct inode *inode, struct file *filp)
struct snapshot_data *data;
int error;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
error = -EBUSY;
@@ -123,7 +123,7 @@ static int snapshot_open(struct inode *inode, struct file *filp)
data->platform_support = 0;
Unlock:
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return error;
}
@@ -132,7 +132,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
swsusp_free();
free_basic_memory_bitmaps();
@@ -146,7 +146,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
PM_POST_HIBERNATION : PM_POST_RESTORE);
atomic_inc(&snapshot_device_available);
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return 0;
}
@@ -158,7 +158,7 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
ssize_t res;
loff_t pg_offp = *offp & ~PAGE_MASK;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
data = filp->private_data;
if (!data->ready) {
@@ -179,7 +179,7 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
*offp += res;
Unlock:
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return res;
}
@@ -191,7 +191,7 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
ssize_t res;
loff_t pg_offp = *offp & ~PAGE_MASK;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
data = filp->private_data;
@@ -208,7 +208,7 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
if (res > 0)
*offp += res;
unlock:
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return res;
}
--
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