path: root/Documentation/ABI/testing/sysfs-devices-power
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authorAlan Stern <stern@rowland.harvard.edu>2010-09-25 23:35:15 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2010-10-17 01:57:47 +0200
commit7490e44239e60293bca0c2663229050c36c660c2 (patch)
tree938cd1cafba133f2d47c648ac01242de841d6d1b /Documentation/ABI/testing/sysfs-devices-power
parent140a6c945211ee911dec776fafa52e03a7d7bb9a (diff)
PM / Runtime: Add no_callbacks flag
Some devices, such as USB interfaces, cannot be power-managed independently of their parents, i.e., they cannot be put in low power while the parent remains at full power. This patch (as1425) creates a new "no_callbacks" flag, which tells the PM core not to invoke the runtime-PM callback routines for the such devices but instead to assume that the callbacks always succeed. In addition, the non-debugging runtime-PM sysfs attributes for the devices are removed, since they are pretty much meaningless. The advantage of this scheme comes not so much from avoiding the callbacks themselves, but rather from the fact that without the need for a process context in which to run the callbacks, more work can be done in interrupt context. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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