Re: Is scsi_cmnd::underflow still useful?

[Matthew Dharm <mdharm-scsi@one-eyed-alien.net>]

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On Mon, Jul 12, 2004 at 07:55:13PM -0500, James Bottomley wrote:
> On Mon, 2004-07-12 at 14:40, Douglas Gilbert wrote:
> > Doesn't look like many LLDs act on scsi_cmnd::underflow.
> > Seems to me that scsi_cmnd::resid is a more general
> > replacement.
> 
> well, I know I suggested a recent use of it to the USB people , so I
> don't think it's entirely unused.  resid can't be a replacement because
> they mean different things:
> 
> resid - number of bytes left over after a transaction
> underflow - driver must return error if less than this amount
> transferred.

I think the recent USB usage of it was because some mid-level drivers look
for the error condition related to the underflow value.

We don't really use it, other than to trigger an error.

Matt

-- 
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

Stef, you just got beaten by a ball of DIRT.
					-- Greg
User Friendly, 12/7/1997

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