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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-12-02 17:30:28 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-12-05 17:43:37 +0300 |
| commit | bc80c2e438dcbfcf748452ec0f7ad5b79ff3ad88 (patch) | |
| tree | 7b1b05fdfbb1be71fc41b18d05855251b9f84bc9 /drivers | |
| parent | 76dcd734eca23168cb008912c0f69ff408905235 (diff) | |
| download | linux-bc80c2e438dcbfcf748452ec0f7ad5b79ff3ad88.tar.xz | |
PM: runtime: Do not call __rpm_callback() from rpm_idle()
Calling __rpm_callback() from rpm_idle() after adding device links
support to the former is a clear mistake.
Not only it causes rpm_idle() to carry out unnecessary actions, but it
is also against the assumption regarding the stability of PM-runtime
status across __rpm_callback() invocations, because rpm_suspend() and
rpm_resume() may run in parallel with __rpm_callback() when it is called
by rpm_idle() and the device's PM-runtime status can be updated by any
of them.
Fixes: 21d5c57b3726 ("PM / runtime: Use device links")
Link: https://lore.kernel.org/linux-pm/36aed941-a73e-d937-2721-4f0decd61ce0@quicinc.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/power/runtime.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index b52049098d4e..14088b5adb55 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -484,7 +484,17 @@ static int rpm_idle(struct device *dev, int rpmflags) dev->power.idle_notification = true; - retval = __rpm_callback(callback, dev); + if (dev->power.irq_safe) + spin_unlock(&dev->power.lock); + else + spin_unlock_irq(&dev->power.lock); + + retval = callback(dev); + + if (dev->power.irq_safe) + spin_lock(&dev->power.lock); + else + spin_lock_irq(&dev->power.lock); dev->power.idle_notification = false; wake_up_all(&dev->power.wait_queue); |