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UPSTREAM: PM: sleep: core: Avoid setting power.must_resume to false

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There are variables(power.may_skip_resume and dev->power.must_resume)
and DPM_FLAG_MAY_SKIP_RESUME flags to control the resume of devices after
a system wide suspend transition.

Setting the DPM_FLAG_MAY_SKIP_RESUME flag means that the driver allows
its "noirq" and "early" resume callbacks to be skipped if the device
can be left in suspend after a system-wide transition into the working
state. PM core determines that the driver's "noirq" and "early" resume
callbacks should be skipped or not with dev_pm_skip_resume() function by
checking power.may_skip_resume variable.

power.must_resume variable is getting set to false in __device_suspend()
function without checking device's DPM_FLAG_MAY_SKIP_RESUME settings.
In problematic scenario, where all the devices in the suspend_late
stage are successful and some device can fail to suspend in
suspend_noirq phase. So some devices successfully suspended in suspend_late
stage are not getting chance to execute __device_suspend_noirq()
to set dev->power.must_resume variable to true and not getting
resumed in early_resume phase.

Add a check for device's DPM_FLAG_MAY_SKIP_RESUME flag before
setting power.must_resume variable in __device_suspend function.

Fixes: 6e176bf8d4 ("PM: sleep: core: Do not skip callbacks in the resume phase")
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Bug: 195393473
Change-Id: I641a7ba20cc14f6519e1869b4651cda894400274
(cherry picked from commit 4a9344cd0aa4499beb3772bbecb40bb78888c0e1)
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
This commit is contained in:
Prasad Sodagudi
2021-09-07 04:24:23 -07:00
committed by Todd Kjos
parent ba98a3a1bb
commit bcbaadf442
1 changed files with 1 additions and 1 deletions
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2
drivers/base/power/main.c
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@@ -1649,7 +1649,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
} }
dev->power.may_skip_resume = true; dev->power.may_skip_resume = true;
dev->power.must_resume = false; dev->power.must_resume = !dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME);
dpm_watchdog_set(&wd, dev); dpm_watchdog_set(&wd, dev);
device_lock(dev); device_lock(dev);