RE: Question: where should the SCSI driver place MODE_SENSE data ?

["Ju, Seokmann" <Seokmann.Ju@lsil.com>]

Any comment on this question would be appreciated.
Thanks you, 

> -----Original Message-----
> From: Ju, Seokmann 
> Sent: Tuesday, March 21, 2006 11:45 AM
> To: 'James Bottomley'
> Cc: linux-scsi; linux-kernel
> Subject: Question: where should the SCSI driver place 
> MODE_SENSE data ?
> 
> In the 2.6 (2.6.9 and scsi-misc in git) kernel, MODE_SENSE 
> SCSI command packet (scsi_cmnd) carries following entries 
> with unexpectedly small in size.
> - request_bufflen
> - bufflen
> 
> Especially for MODE SENSE with page code 8 (caching page), 
> driver has minumum 12 Bytes MODE_SENSE data to deliver 
> besides 'mode parameter header' and 'block descriptors'.
> When I dump those entries, they both are 4 Bytes in size.
> To me, it seems like that SCSI mid layer allocated 512 Bytes 
> for MODE_SENSE data buffer, but the buffer length passed down 
> to LLD incorrectly.
> 
> Please guide me if there is anything missing.
> 
> Thank you,
> 
> Seokmann
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