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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-02 15:17:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-02 15:17:08 -0700 |
| commit | 9314a0e9c711b0c092158ee9e0ed24d5ea25c90a (patch) | |
| tree | 8853c610c8d893f2e83ee2c1275a8e47b8abdd2d | |
| parent | Merge tag 'trace-v5.12-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace (diff) | |
| parent | Merge branch 'pm-cpufreq' (diff) | |
| download | linux-dev-9314a0e9c711b0c092158ee9e0ed24d5ea25c90a.tar.xz linux-dev-9314a0e9c711b0c092158ee9e0ed24d5ea25c90a.zip | |
Merge tag 'pm-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fixes from Rafael Wysocki:
"These fix a race condition and an ordering issue related to using
device links in the runtime PM framework and two kerneldoc comments in
cpufreq.
Specifics:
- Fix race condition related to the handling of supplier devices
during consumer device probe and fix the order of decrementation of
two related reference counters in the runtime PM core code handling
supplier devices (Adrian Hunter).
- Fix kerneldoc comments in cpufreq that have not been updated along
with the functions documented by them (Geert Uytterhoeven)"
* tag 'pm-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
PM: runtime: Fix race getting/putting suppliers at probe
PM: runtime: Fix ordering in pm_runtime_get_suppliers()
cpufreq: Fix scaling_{available,boost}_frequencies_show() comments
| -rw-r--r-- | drivers/base/power/runtime.c | 10 | ||||
| -rw-r--r-- | drivers/cpufreq/freq_table.c | 4 |
2 files changed, 10 insertions, 4 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index d54e540067bf..fe1dad68aee4 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1690,8 +1690,8 @@ void pm_runtime_get_suppliers(struct device *dev) device_links_read_lock_held()) if (link->flags & DL_FLAG_PM_RUNTIME) { link->supplier_preactivated = true; - refcount_inc(&link->rpm_active); pm_runtime_get_sync(link->supplier); + refcount_inc(&link->rpm_active); } device_links_read_unlock(idx); @@ -1704,6 +1704,8 @@ void pm_runtime_get_suppliers(struct device *dev) void pm_runtime_put_suppliers(struct device *dev) { struct device_link *link; + unsigned long flags; + bool put; int idx; idx = device_links_read_lock(); @@ -1712,7 +1714,11 @@ void pm_runtime_put_suppliers(struct device *dev) device_links_read_lock_held()) if (link->supplier_preactivated) { link->supplier_preactivated = false; - if (refcount_dec_not_one(&link->rpm_active)) + spin_lock_irqsave(&dev->power.lock, flags); + put = pm_runtime_status_suspended(dev) && + refcount_dec_not_one(&link->rpm_active); + spin_unlock_irqrestore(&dev->power.lock, flags); + if (put) pm_runtime_put(link->supplier); } diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c index d3f756f7b5a0..67e56cf638ef 100644 --- a/drivers/cpufreq/freq_table.c +++ b/drivers/cpufreq/freq_table.c @@ -267,7 +267,7 @@ struct freq_attr cpufreq_freq_attr_##_name##_freqs = \ __ATTR_RO(_name##_frequencies) /* - * show_scaling_available_frequencies - show available normal frequencies for + * scaling_available_frequencies_show - show available normal frequencies for * the specified CPU */ static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy, @@ -279,7 +279,7 @@ cpufreq_attr_available_freq(scaling_available); EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs); /* - * show_available_boost_freqs - show available boost frequencies for + * scaling_boost_frequencies_show - show available boost frequencies for * the specified CPU */ static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy, |