On Thu, Nov 17, Alan Stern wrote:

> This patch (as605) removes the private udev->serialize semaphore, relying 
> instead on the locking provided by the embedded struct device's semaphore.  
> The changes are confined to the core, except that the usb_trylock_device 
> routine now uses the return convention of down_trylock rather than 
> down_read_trylock (they return opposite values for no good reason).
> 
> A couple of other associated changes are included as well:
> 
>       Now that we aren't concerned about HCDs that avoid using the
>       hcd glue layer, usb_disconnect no longer needs to acquire the
>       usb_bus_lock -- that can be done by usb_remove_hcd where it
>       belongs.
> 
>       Devices aren't locked over the same scope of code in 
>       usb_new_device and hub_port_connect_change as they used to be.  
>       This shouldn't cause any trouble.
> 
> Along with the preceding driver core patch, this needs a lot of testing.

Ok, as noted in another (unrelated) thread, this patch breaks
appearently the keyboard all ppc64 pSeries systems, but not Apple G5.
Any ideas how to get a working 2.6.16 for them? Current Linus tree
doesnt work any better.


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