Re: Composite USB device reset /drivers/usb/core/hub.c - binding order problem

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On Thu, 17 Mar 2016, Mikolaj Ch wrote:

> Hi,
> 
> I have a composite usb device where order of binding the drivers to
> interfaces matters.
> When the device is plugged in binding is from 0-th till n-th interface
> but in usb_reset_device function in  /drivers/usb/core/hub.c after
> reset binding is done in revers order from n-th till 0.
> Is there a reason for doing so ?

You are reading the code wrong.  usb_reset_device() calls the 
post_reset methods of the interface drivers in reverse order, but the 
rebinding is done by rebind_marked_interfaces() in driver.c in forward 
order.

Alan Stern

> Can I expect any disadvantages after changing this order to be from 0
> till n-th ?
> 
> I know that the easiest solution is to claim the device driver is
> badly written but I don't have a possibility to change it so I want to
> know if changing this order in usb cored driver is possible without
> affecting other functionality.

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