[SCSI] scsi_eh_prep_cmnd should save scmd->underflow
This patch (as1116) fixes a bug in scsi_eh_prep_cmnd() and scsi_eh_restore_cmnd(). These routines are supposed to save any values they change and restore them later, but someone forgot to save & restore scmd->underflow. This fixes part of the problem reported in Bugzilla #9638. [jejb: fix up rejections around DIF/DIX] Signed-off-by: NAlan Stern <stern@rowland.harvard.edu> Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>
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