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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-06-03 21:49:52 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-06-03 21:49:52 +0200
commit45f0a85c8258741d11bda25c0a5669c06267204a (patch)
treea618cce0583426a5c7f53f56cf19139a6f9733ce /drivers/usb
parentcd38ca854de15b26eb91009137cbe157d8a8e773 (diff)
downloadop-kernel-dev-45f0a85c8258741d11bda25c0a5669c06267204a.zip
op-kernel-dev-45f0a85c8258741d11bda25c0a5669c06267204a.tar.gz
PM / Runtime: Rework the "runtime idle" helper routine
The "runtime idle" helper routine, rpm_idle(), currently ignores return values from .runtime_idle() callbacks executed by it. However, it turns out that many subsystems use pm_generic_runtime_idle() which checks the return value of the driver's callback and executes pm_runtime_suspend() for the device unless that value is not 0. If that logic is moved to rpm_idle() instead, pm_generic_runtime_idle() can be dropped and its users will not need any .runtime_idle() callbacks any more. Moreover, the PCI, SCSI, and SATA subsystems' .runtime_idle() routines, pci_pm_runtime_idle(), scsi_runtime_idle(), and ata_port_runtime_idle(), respectively, as well as a few drivers' ones may be simplified if rpm_idle() calls rpm_suspend() after 0 has been returned by the .runtime_idle() callback executed by it. To reduce overall code bloat, make the changes described above. Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com> Tested-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Kevin Hilman <khilman@linaro.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Alan Stern <stern@rowland.harvard.edu>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/driver.c3
-rw-r--r--drivers/usb/core/port.c1
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 6eab440..7609ac4 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1765,7 +1765,8 @@ int usb_runtime_idle(struct device *dev)
*/
if (autosuspend_check(udev) == 0)
pm_runtime_autosuspend(dev);
- return 0;
+ /* Tell the core not to suspend it, though. */
+ return -EBUSY;
}
int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index b8bad29..8c1b2c5 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -141,7 +141,6 @@ static const struct dev_pm_ops usb_port_pm_ops = {
#ifdef CONFIG_PM_RUNTIME
.runtime_suspend = usb_port_runtime_suspend,
.runtime_resume = usb_port_runtime_resume,
- .runtime_idle = pm_generic_runtime_idle,
#endif
};
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