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
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