[Nut-upsdev] usbhid-ups fails with Belkin F6C120-UNV in nut-2.4.3

[Arjen de Korte]

Citeren Jon Burgess <jburgess777 op googlemail.com>:

>> Several years ago on the linux-usb list, it was often pointed out that
>> the kernel was supposed to honor the wMaxPacketSize field, and
>> fragment the requests accordingly. While this was suggested for
>> performance reasons (fewer round trips between user and kernel space),
>> it should still hold true for less frequent transfers.
> In this case we are reading the data, I don't know if there is much the
> kernel can do to fragment this, I don't see any concept of an offset
> field when reading the report.

There is no need for an offset field. If you read/write the same  
report again and the device will return/accept the next chunk of data.  
The drawback here is that this most likely lead to a timeout after the  
last available data has been read on the next read operation. We need  
to deal with that.

Best regards, Arjen
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