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authorRafael J. Wysocki <rjw@sisk.pl>2011-09-29 22:29:44 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-10-04 21:54:26 +0200
commit1a9a91525d806f2b3bd8b57b963755a96fd36ce2 (patch)
tree511db2ab0871872bce759d35b7ffd22b9d7fc3f5 /fs
parentPM QoS: Add global notification mechanism for device constraints (diff)
downloadlinux-1a9a91525d806f2b3bd8b57b963755a96fd36ce2.tar.xz
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PM / QoS: Add function dev_pm_qos_read_value() (v3)
To read the current PM QoS value for a given device we need to make sure that the device's power.constraints object won't be removed while we're doing that. For this reason, put the operation under dev->power.lock and acquire the lock around the initialization and removal of power.constraints. Moreover, since we're using the value of power.constraints to determine whether or not the object is present, the power.constraints_state field isn't necessary any more and may be removed. However, dev_pm_qos_add_request() needs to check if the device is being removed from the system before allocating a new PM QoS constraints object for it, so make it use the power.power_state field of struct device for this purpose. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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