usbcore: set device and power states properly

This patch (as733) fixes up the places where device states and power
states are set in usbcore.  Right now things are duplicated or missing;
this should straighten things out.

The idea is that udev->state is USB_STATE_SUSPENDED exactly when the
device's upstream port has been suspended, whereas
udev->dev.power.power_state.event reflects the result of the last call
to the suspend/resume routines (which might not actually change the
device state, especially if CONFIG_USB_SUSPEND isn't set).

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index eefc985..92ecc4e 100644 (file)
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -755,48 +755,57 @@ EXPORT_SYMBOL_GPL_FUTURE(usb_deregister);
 static int suspend_device(struct usb_device *udev, pm_message_t msg)
 {
        struct usb_device_driver        *udriver;
+       int                             status = 0;
 
        if (udev->dev.driver == NULL)
-               return 0;
+               goto done;
        udriver = to_usb_device_driver(udev->dev.driver);
        if (udev->dev.power.power_state.event == msg.event)
-               return 0;
-       return udriver->suspend(udev, msg);
+               goto done;
+       status = udriver->suspend(udev, msg);
+
+done:
+       if (status == 0)
+               udev->dev.power.power_state.event = msg.event;
+       return status;
 }
 
 /* Caller has locked udev */
 static int resume_device(struct usb_device *udev)
 {
        struct usb_device_driver        *udriver;
+       int                             status = 0;
 
        if (udev->dev.power.power_state.event == PM_EVENT_ON)
-               return 0;
-
-       /* mark things as "on" immediately, no matter what errors crop up */
-       udev->dev.power.power_state.event = PM_EVENT_ON;
+               goto done;
 
        if (udev->dev.driver == NULL)
-               return 0;
+               goto done;
        udriver = to_usb_device_driver(udev->dev.driver);
        if (udev->state == USB_STATE_NOTATTACHED)
-               return 0;
-       return udriver->resume(udev);
+               goto done;
+       status = udriver->resume(udev);
+
+done:
+       if (status == 0)
+               udev->dev.power.power_state.event = PM_EVENT_ON;
+       return status;
 }
 
 /* Caller has locked intf's usb_device */
 static int suspend_interface(struct usb_interface *intf, pm_message_t msg)
 {
        struct usb_driver       *driver;
-       int                     status;
+       int                     status = 0;
 
        if (intf->dev.driver == NULL)
-               return 0;
+               goto done;
 
        driver = to_usb_driver(intf->dev.driver);
 
        /* with no hardware, USB interfaces only use FREEZE and ON states */
        if (!is_active(intf))
-               return 0;
+               goto done;
 
        if (driver->suspend && driver->resume) {
                status = driver->suspend(intf, msg);
@@ -810,8 +819,11 @@ static int suspend_interface(struct usb_interface *intf, pm_message_t msg)
                dev_warn(&intf->dev, "no suspend for driver %s?\n",
                                driver->name);
                mark_quiesced(intf);
-               status = 0;
        }
+
+done:
+       if (status == 0)
+               intf->dev.power.power_state.event = msg.event;
        return status;
 }
 
@@ -820,24 +832,19 @@ static int resume_interface(struct usb_interface *intf)
 {
        struct usb_driver       *driver;
        struct usb_device       *udev;
-       int                     status;
+       int                     status = 0;
 
        if (intf->dev.power.power_state.event == PM_EVENT_ON)
-               return 0;
-
-       /* mark things as "on" immediately, no matter what errors crop up */
-       intf->dev.power.power_state.event = PM_EVENT_ON;
+               goto done;
 
-       if (intf->dev.driver == NULL) {
-               intf->dev.power.power_state.event = PM_EVENT_FREEZE;
-               return 0;
-       }
+       if (intf->dev.driver == NULL)
+               goto done;
 
        driver = to_usb_driver(intf->dev.driver);
 
        udev = interface_to_usbdev(intf);
        if (udev->state == USB_STATE_NOTATTACHED)
-               return 0;
+               goto done;
 
        /* if driver was suspended, it has a resume method;
         * however, sysfs can wrongly mark things as suspended
@@ -845,15 +852,21 @@ static int resume_interface(struct usb_interface *intf)
         */
        if (driver->resume) {
                status = driver->resume(intf);
-               if (status) {
+               if (status)
                        dev_err(&intf->dev, "%s error %d\n",
                                        "resume", status);
-                       mark_quiesced(intf);
-               }
-       } else
+               else
+                       mark_active(intf);
+       } else {
                dev_warn(&intf->dev, "no resume for driver %s?\n",
                                driver->name);
-       return 0;
+               mark_active(intf);
+       }
+
+done:
+       if (status == 0)
+               intf->dev.power.power_state.event = PM_EVENT_ON;
+       return status;
 }
 
 /* Caller has locked udev */

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index a391120..7af53db 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1582,9 +1582,10 @@ static int __usb_port_suspend (struct usb_device *udev, int port1)
        if (udev->parent)
                status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
                                udev);
-
-       if (status == 0)
-               udev->dev.power.power_state = PMSG_SUSPEND;
+       else {
+               dev_dbg(&udev->dev, "usb suspend\n");
+               usb_set_device_state(udev, USB_STATE_SUSPENDED);
+       }
        return status;
 }
 
@@ -1617,8 +1618,6 @@ int usb_port_suspend(struct usb_device *udev)
                return -ENODEV;
        return __usb_port_suspend(udev, udev->portnum);
 #else
-       /* NOTE:  udev->state unchanged, it's not lying ... */
-       udev->dev.power.power_state = PMSG_SUSPEND;
        return 0;
 #endif
 }
@@ -1647,7 +1646,6 @@ static int finish_port_resume(struct usb_device *udev)
        usb_set_device_state(udev, udev->actconfig
                        ? USB_STATE_CONFIGURED
                        : USB_STATE_ADDRESS);
-       udev->dev.power.power_state = PMSG_ON;
 
        /* 10.5.4.5 says be sure devices in the tree are still there.
         * For now let's assume the device didn't go crazy on resume,