Re: [PATCH v11 2/4] PM / Domains: add setter for dev.pm_domain

On Thursday, January 07, 2016 03:47:01 PM Tomeu Vizoso wrote:

On 10 November 2015 at 10:33, Daniel Kurtz [off-list ref] wrote:
[snip]

quoted

The problem appears to be that:
  * On boot, platform_drv_probe() calls dev_pm_domain_attach() before
drv->probe(); thus, it calls dev_pm_domain_attach() while the device
is unbound.

 * However, for a platform_device, the reboot path calls
device_shutdown(), but not __device_release_driver():
device_shutdown()
  dev->driver->shutdown => platform_drv_shutdown()
    dev_pm_domain_detach()
       dev->pm_domain->detach() => genpd_dev_pm_detach()
         pm_genpd_remove_device()
            dev_pm_domain_set(dev, NULL);

So, for a platform_device in a genpd power domain with .shutdown
installed, platform_drv_shutdown() calls dev_pm_domain_detach() while
the device is still bound, which triggers the WARN().

Hi Rafael, Alan and Ulf,

do you have any suggestion about this? I don't really understand why
the device is detached from the domain on shutdown.

Well, this looks like a bug to me.

Thanks,
Rafael

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