Greg, You are right ( of course ), but using the buffer given by the usb-serial seems to bo logic as I said. By this way I don't create unnecessary buffer. But in bulk transfer, the buffer_size can be greater than The value given by the endpoint. The usb lowlevel will split the bulk tranfsert. So, why this limit in the usb-serial.c ? For the moment , I kfree the buffer In the my open function and create a new one bigger.
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