[Bug 47424] DataTransferLength in SCSI_PASS_THROUGH and SCSI_PASS_THROUGH_DIRECT *must* have return value

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=47424

--- Comment #7 from Zebediah Figura <z.figura12 at gmail.com> ---
I don't think that's how it works, no. The documentation clearly states that
resid "is 'dxfer_len' less the number of bytes actually transferred." In your
example dxfer_len is 20480, so the driver should set resid to 20480 - 2048 =
18432, causing us to return 20480 - 18432 = 2048 in DataTransferLength. A quick
skim of the Linux source suggests this is indeed how scsi drivers behave,
though I won't claim to have any familiarity with that code.

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