Commit 195af2cc authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
Browse files

USB: fix warning caused by autosuspend counter going negative



This patch (as937) fixes a minor bug in the autosuspend usage-counting
code.  Each hub's usage counter keeps track of the number of
unsuspended children.  However the current driver increments the
counter after registering a new child, by which time the child may
already have been suspended and caused the counter to go negative.
The obvious solution is to increment the counter before registering
the child.
Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 69d42a78
......@@ -1335,6 +1335,10 @@ int usb_new_device(struct usb_device *udev)
udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
/* Increment the parent's count of unsuspended children */
if (udev->parent)
usb_autoresume_device(udev->parent);
/* Register the device. The device driver is responsible
* for adding the device files to sysfs and for configuring
* the device.
......@@ -1342,13 +1346,11 @@ int usb_new_device(struct usb_device *udev)
err = device_add(&udev->dev);
if (err) {
dev_err(&udev->dev, "can't device_add, error %d\n", err);
if (udev->parent)
usb_autosuspend_device(udev->parent);
goto fail;
}
/* Increment the parent's count of unsuspended children */
if (udev->parent)
usb_autoresume_device(udev->parent);
exit:
return err;
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment