On Wed, 17 Sep 2014, Petr Mladek wrote:
> USB hub has started to use a workqueue instead of kthread. Let's update
> the documentation and comments here and there.
>
> This patch mostly just replaces "khubd" with "hub_wq". There are only few
> exceptions where the whole sentence was updated. These more complicated
> changes can be found in the following files:
>
> Documentation/usb/hotplug.txt
> drivers/net/usb/usbnet.c
> drivers/usb/core/hcd.c
> drivers/usb/host/ohci-hcd.c
> drivers/usb/host/xhci.c
Okay, here's a real issue.
> @@ -2042,7 +2042,7 @@ static void choose_devnum(struct usb_device *udev)
> int devnum;
> struct usb_bus *bus = udev->bus;
>
> - /* If khubd ever becomes multithreaded, this will need a lock */
> + /* If hub_wq ever becomes multithreaded, this will need a lock */
> if (udev->wusb) {
> devnum = udev->portnum + 1;
> BUG_ON(test_bit(devnum, bus->devmap.devicemap));
You probably didn't notice when changing this comment. But in fact,
workqueues _are_ multithreaded. Therefore you need to add a lock to
this routine.
Still, apart from these relatively minor issues, the series looks good.
Alan Stern
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