On 29-06-21, 13:11, Wolfram Sang wrote:
quoted
The case when ``length of \field{write_buf}''=0, and at the same time,
``length of \field{read_buf}''=0 is called not-a-read-write request
and result for such a request is I2C device specific.
Obviously, I don't know much about the specs and their wording. Still I
wonder if we can't call it a zero length transfer?
Maybe that.
This is allowed by
the I2C standard and SMBus has even a proper name for it (SMBUS_QUICK).
From my point of view, I would not say it is device specific because
devices are expected to ACK such a message.
Actually we should skip the last line from my diff, i.e. completely
drop "and result for such a request is I2C device specific".
The device (host in virtio spec terminology) still needs to return
success/failure as it does for other requests. Nothing special here.
--
viresh
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