[PATCH 13/19] fcp: Do not interpret check condition as underrun

Robert Love
2013-10-21T18:01:40Z

This patch avoids that the FCoE initiator sends a REC message after
having received a SCSI response with non-zero status and non-zero
DATA IN buffer length.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
---
drivers/scsi/libfc/fc_fcp.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
index 5fd0f1f..1d7e76e 100644
--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -902,7 +902,8 @@ static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
/*
* Check for missing or extra data frames.
*/
- if (unlikely(fsp->xfer_len != expected_len)) {
+ if (unlikely(fsp->cdb_status == SAM_STAT_GOOD &&
+ fsp->xfer_len != expected_len)) {
if (fsp->xfer_len < expected_len) {
/*
* Some data may be queued locally,
@@ -955,12 +956,11 @@ static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
* Test for transport underrun, independent of response
* underrun status.
*/
- if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
+ if (fsp->cdb_status == SAM_STAT_GOOD &&
+ fsp->xfer_len < fsp->data_len && !fsp->io_status &&
(!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
- fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
+ fsp->xfer_len < fsp->data_len - fsp->scsi_resid))
fsp->status_code = FC_DATA_UNDRUN;
- fsp->io_status = 0;
- }
}

seq = fsp->seq_ptr;