Re: SCSI over USB showstopper bug?

[Joerg Schilling]

Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:

> On Tue, 2006-10-31 at 23:08 +0100, Joerg Schilling wrote:
> > Hi,
> > 
> > it looks as if SG_GET_RESERVED_SIZE & SG_SET_RESERVED_SIZE
> > are not in interaction with the underlying SCSI transport.
> > 
> > Programs like readcd and cdda2wav that try to get very large SCSI
> > transfer buffers get a confirmation for nearly any SCSI transfer size 
> > but later when readcd/cdda2wav try to transfer data with an
> > actual SCSI command, they fail with ENOMEM.
> > 
> > Correct fix: let sg.c make a callback to the underlying SCSI transport
> > 		and let it get a confirmation tfor the buffer size.
> > 
> > Quick and dirty fix: reduce the maximum allowed DMA size to the smallest
> > 		max DMA size of all SCSI transports.
>
> real good fix:
>
> use SG_IO on the device directly that checks this already

>From looking into the source, this claim seems to be wrong.

Jörg

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