From: Rafael J. Wysocki <rjw@sisk.pl>
Date: Sun, 5 Aug 2012 23:47:29 +0000 (+0200)
Subject: PM / Domains: Do not measure start time for "irq safe" devices
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~39^2~12^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e2e3e4e51ebdcd757079bd7ec5dcc9dfb2ebce24;p=pandora-kernel.git

PM / Domains: Do not measure start time for "irq safe" devices

The genpd_start_dev() routine used by pm_genpd_runtime_resume()
to put "irq safe" devices into the full power state measures the
time necessary to "start" the device and updates its PM QoS timing
data if necessary.  This may lead to a deadlock if the given device
is a clock source and genpd_start_dev() is invoked from within the
clock source's .enable() routine, which will happen if that routine
uses pm_runtime_get_sync(), for example, to ensure that the device
is operational.

For this reason, introduce a special routine analogous to
genpd_start_dev(), called genpd_start_dev_no_timing(), that doesn't
carry out the time measurement, and make pm_genpd_runtime_resume()
use it instead of genpd_start_dev() to power up "irq safe" devices.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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