[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: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index fc4b2d0..171b82d 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -667,6 +667,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
        ses->sdb = scmd->sdb;
        ses->next_rq = scmd->request->next_rq;
        ses->result = scmd->result;
+       ses->underflow = scmd->underflow;
        ses->prot_op = scmd->prot_op;
 
        scmd->prot_op = SCSI_PROT_NORMAL;
@@ -727,6 +728,7 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
        scmd->sdb = ses->sdb;
        scmd->request->next_rq = ses->next_rq;
        scmd->result = ses->result;
+       scmd->underflow = ses->underflow;
        scmd->prot_op = ses->prot_op;
 }
 EXPORT_SYMBOL(scsi_eh_restore_cmnd);

diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index e5499ed..06a8790 100644 (file)
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -74,6 +74,7 @@ struct scsi_eh_save {
        /* saved state */
        int result;
        enum dma_data_direction data_direction;
+       unsigned underflow;
        unsigned char cmd_len;
        unsigned char prot_op;
        unsigned char *cmnd;