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>

1 files changed, 42 insertions, 29 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index eefc98584eac..92ecc4eb1e88 100644
--- 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 */