USB: skip autosuspended devices during system resume

System suspends and hibernation are supposed to be as transparent as
possible.  By this reasoning, if a USB device is already autosuspended
before the system sleep begins then it should remain autosuspended
after the system wakes up.

This patch (as1001) adds a skip_sys_resume flag to the usb_device
structure and uses it to avoid waking up devices which were suspended
when a system sleep began.

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 3f73424..8c1eac2 100644 (file)
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1540,9 +1540,21 @@ int usb_external_resume_device(struct usb_device *udev)
 
 static int usb_suspend(struct device *dev, pm_message_t message)
 {
+       struct usb_device       *udev;
+
        if (!is_usb_device(dev))        /* Ignore PM for interfaces */
                return 0;
-       return usb_external_suspend_device(to_usb_device(dev), message);
+       udev = to_usb_device(dev);
+
+       /* If udev is already suspended, we can skip this suspend and
+        * we should also skip the upcoming system resume. */
+       if (udev->state == USB_STATE_SUSPENDED) {
+               udev->skip_sys_resume = 1;
+               return 0;
+       }
+
+       udev->skip_sys_resume = 0;
+       return usb_external_suspend_device(udev, message);
 }
 
 static int usb_resume(struct device *dev)
@@ -1553,13 +1565,14 @@ static int usb_resume(struct device *dev)
                return 0;
        udev = to_usb_device(dev);
 
-       /* If autoresume is disabled then we also want to prevent resume
-        * during system wakeup.  However, a "persistent-device" reset-resume
-        * after power loss counts as a wakeup event.  So allow a
-        * reset-resume to occur if remote wakeup is enabled. */
-       if (udev->autoresume_disabled) {
+       /* If udev->skip_sys_resume is set then udev was already suspended
+        * when the system suspend started, so we don't want to resume
+        * udev during this system wakeup.  However a reset-resume counts
+        * as a wakeup event, so allow a reset-resume to occur if remote
+        * wakeup is enabled. */
+       if (udev->skip_sys_resume) {
                if (!(udev->reset_resume && udev->do_remote_wakeup))
-                       return -EPERM;
+                       return -EHOSTUNREACH;
        }
        return usb_external_resume_device(udev);
 }

diff --git a/include/linux/usb.h b/include/linux/usb.h
index c10935f..c5c8f16 100644 (file)
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -430,6 +430,7 @@ struct usb_device {
        unsigned persist_enabled:1;     /* USB_PERSIST enabled for this dev */
        unsigned autosuspend_disabled:1; /* autosuspend and autoresume */
        unsigned autoresume_disabled:1;  /*  disabled by the user */
+       unsigned skip_sys_resume:1;     /* skip the next system resume */
 #endif
 };
 #define        to_usb_device(d) container_of(d, struct usb_device, dev)