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Subject[42/98] [SCSI] libfc: fix ddp in fc_fcp for 0 xid
2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Yi Zou <yi.zou@intel.com>

commit 5e472d077f45de4f37365171bd742f18b3ef20de upstream.

xid 0 was used as an indication of invalid xid before but now xid 0
can be used as a valid exchange i. This patch fixes the ddp completion
in fcp layer, i.e., in fc_fcp.c:fc_fcp_ddp_done() function, to make sure it
does not use xid 0 for indication of an invalid xid, instead, it now
uses use FC_XID_UNKNOWN for such indication.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/scsi/libfc/fc_fcp.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -302,10 +302,13 @@ static void fc_fcp_ddp_done(struct fc_fc
if (!fsp)
return;

+ if (fsp->xfer_ddp == FC_XID_UNKNOWN)
+ return;
+
lp = fsp->lp;
- if (fsp->xfer_ddp && lp->tt.ddp_done) {
+ if (lp->tt.ddp_done) {
fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp);
- fsp->xfer_ddp = 0;
+ fsp->xfer_ddp = FC_XID_UNKNOWN;
}
}

@@ -1708,6 +1711,7 @@ int fc_queuecommand(struct scsi_cmnd *sc
fsp->cmd = sc_cmd; /* save the cmd */
fsp->lp = lp; /* save the softc ptr */
fsp->rport = rport; /* set the remote port ptr */
+ fsp->xfer_ddp = FC_XID_UNKNOWN;
sc_cmd->scsi_done = done;

/*



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