Messages in this thread | | | Subject | Re: SCSI over USB showstopper bug? | From | Arjan van de Ven <> | Date | Tue, 31 Oct 2006 23:18:10 +0100 |
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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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