Messages in this thread | | | From | Kevin Hilman <> | Subject | Re: [PATCH] PM / Domains: defer dev_pm_domain_set() until genpd->attach_dev succeeds if present | Date | Tue, 11 Jul 2017 11:53:05 -0700 |
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"Rafael J. Wysocki" <rafael@kernel.org> writes:
> On Thu, Jun 29, 2017 at 8:00 PM, Sudeep Holla <sudeep.holla@arm.com> wrote: >> If the genpd->attach_dev or genpd->power_on fails, genpd_dev_pm_attach >> may return -EPROBE_DEFER initially. However genpd_alloc_dev_data sets >> the PM domain for the device unconditionally. >> >> When subsequent attempts are made to call genpd_dev_pm_attach, it may >> return -EEXISTS checking dev->pm_domain without re-attempting to call >> attach_dev or power_on. >> >> platform_drv_probe then attempts to call drv->probe as the return value >> -EEXIST != -EPROBE_DEFER, which may end up in a situation where the >> device is accessed without it's power domain switched on. >> >> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> >> Cc: Kevin Hilman <khilman@kernel.org> >> Cc: Ulf Hansson <ulf.hansson@linaro.org> >> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> > > Ulf, this looks like a genuine fix to me, any comments? >
This looks like the right fix to me.
Acked-by: Kevin Hilman <khilman@baylibre.com>
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