Re: 2.6.7-mm7

[Andrew Morton]

Jesse Stockall <stockall@xxxxxxxx> wrote:
>
>  + *
>  + * Unfortunately we have to use a separate wait queue, because we need
>  + * to make sure that a thread waiting for a writelock won't block other
>  + * threads from acquiring a readlock.
>    */
>   void usb_lock_all_devices(void)
>   {
>  -       down_write(&usb_all_devices_rwsem);
>  +       wait_event(usb_all_devices_wqh,
>  +                       down_write_trylock(&usb_all_devices_rwsem));

That's a bit unusual.  Could you (or Alan) please explain the reason for
this a little more?
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