[SCSI] wd7000: proper fix for boards without sg support
- code used to set sg_tablesize to zero for board revision less than 6. This is no longer supported, therefore I use sg_tablesize=1 and open code the sg handling for that case. - Get rid of use of SG_NONE which will be removed soon. Signed-off-by: NBoaz Harrosh <bharrosh@panasas.com> Signed-off-by: NJames <James.Bottomley@HansenPartnership.com> Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>
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