net2280: is use_dma_chaining obsolete?

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Hello

I cannot make work the parameter use_dma_chaining with g_mass_storage
and a usb3380 device. The initial enumeration works, but after a
couple of frames the enumeration is restarted. If I compare usbmon
with and without the parameter I can see that the device fails to
reply to the host.

 While going through the code I realized that there is only on scathe
gather descriptor per endpoint and I wonder how can you make work a
dma_chain with only one descriptor!.

 I think the driver is expecting a special pattern of execution or
maybe (probably) I am not understanding the code right.

  Can somebody confirm that this parameter works on a net2280, and if
not, can I remove the obsolete code, so no other person loses some
hours and gray hair :) ?

  Thanks!

-- 
Ricardo Ribalda
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