On Sat, 2016-01-30 at 12:54 +0100, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wyso...@intel.com> > > There is a WARN_ON() in dev_pm_domain_set() that triggers on attempts > to set the pm_domain pointer for devices with a driver bound. > > However, that WARN_ON() triggers on attempts to clear the pointer > too and the test it uses is based on checking the device's > p->knode_driver pointer which still is set when the device bus > type's/driver's ->remove callback has been executed. This > leads to false-positive warnings when bus type code calls > dev_pm_domain_set() to clear the pm_domain pointer after > invoking the driver's ->remove() callback. > > To avoid those false-positives, make dev_pm_domain_set() check > if the pointer passed to it is NULL and skip the warning in > that case.
Tested on Intel Braswell where modprobe -r sdhci-acpi caused a warning before this patch. Tested-by: Andy Shevchenko <andriy.shevche...@linux.intel.com> > > Fixes: 989561de9b51 (PM / Domains: add setter for dev.pm_domain) > Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> > --- > drivers/base/power/common.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > Index: linux-pm/drivers/base/power/common.c > =================================================================== > --- linux-pm.orig/drivers/base/power/common.c > +++ linux-pm/drivers/base/power/common.c > @@ -146,7 +146,7 @@ void dev_pm_domain_set(struct device *de > if (dev->pm_domain == pd) > return; > > - WARN(device_is_bound(dev), > + WARN(pd && device_is_bound(dev), > "PM domains can only be changed for unbound > devices\n"); > dev->pm_domain = pd; > device_pm_check_callbacks(dev); > -- Andy Shevchenko <andriy.shevche...@linux.intel.com> Intel Finland Oy
