| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.13 053/110] PM: core: Fix device_pm_check_callbacks() | Date | Tue, 3 Oct 2017 14:29:15 +0200 |
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4.13-stable review patch. If anyone has any objections, please let me know.
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
commit 157c460e10cb6eca29ccbd0f023db159d0c55ec7 upstream.
The device_pm_check_callbacks() function doesn't check legacy ->suspend and ->resume callback pointers under the device's bus type, class and driver, so in some cases it may set the no_pm_callbacks flag for the device incorrectly and then the callbacks may be skipped during system suspend/resume, which shouldn't happen.
Fixes: aa8e54b55947 (PM / sleep: Go direct_complete if driver has no callbacks) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/base/power/main.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1835,10 +1835,13 @@ void device_pm_check_callbacks(struct de { spin_lock_irq(&dev->power.lock); dev->power.no_pm_callbacks = - (!dev->bus || pm_ops_is_empty(dev->bus->pm)) && - (!dev->class || pm_ops_is_empty(dev->class->pm)) && + (!dev->bus || (pm_ops_is_empty(dev->bus->pm) && + !dev->bus->suspend && !dev->bus->resume)) && + (!dev->class || (pm_ops_is_empty(dev->class->pm) && + !dev->class->suspend && !dev->class->resume)) && (!dev->type || pm_ops_is_empty(dev->type->pm)) && (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) && - (!dev->driver || pm_ops_is_empty(dev->driver->pm)); + (!dev->driver || (pm_ops_is_empty(dev->driver->pm) && + !dev->driver->suspend && !dev->driver->resume)); spin_unlock_irq(&dev->power.lock); }
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