[SCSI] libfc: Do not retry if the new state is not the same as old state

For instance, if there is a Plogi pending (remote port is in Plogi state),
and the state changes to say NONE (because the port is being logged off),
then when the Plogi resp times out, do not start a retry.

This patch partially reverts an earlier patch (libfc: check for err when
recv and state is incorrect), by moving the state check back to before
checking for error. However, if the state does not match, then there is
an additional check to see if its an error ptr or a real frame before
jumping to err or out respectively.

Signed-off-by: Abhijeet Joglekar <abjoglek@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 28 insertions, 20 deletions

diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
index 0472bb7..eef70b4 100644
--- a/drivers/scsi/libfc/fc_rport.c
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -505,17 +505,19 @@ static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
 	FC_DEBUG_RPORT("Received a PLOGI response from port (%6x)\n",
 		       rport->port_id);
 
-	if (IS_ERR(fp)) {
-		fc_rport_error_retry(rport, fp);
-		goto err;
-	}
-
 	if (rdata->rp_state != RPORT_ST_PLOGI) {
 		FC_DBG("Received a PLOGI response, but in state %s\n",
 		       fc_rport_state(rport));
+		if (IS_ERR(fp))
+			goto err;
 		goto out;
 	}
 
+	if (IS_ERR(fp)) {
+		fc_rport_error_retry(rport, fp);
+		goto err;
+	}
+
 	op = fc_frame_payload_op(fp);
 	if (op == ELS_LS_ACC &&
 	    (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
@@ -614,17 +616,19 @@ static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
 	FC_DEBUG_RPORT("Received a PRLI response from port (%6x)\n",
 		       rport->port_id);
 
-	if (IS_ERR(fp)) {
-		fc_rport_error_retry(rport, fp);
-		goto err;
-	}
-
 	if (rdata->rp_state != RPORT_ST_PRLI) {
 		FC_DBG("Received a PRLI response, but in state %s\n",
 		       fc_rport_state(rport));
+		if (IS_ERR(fp))
+			goto err;
 		goto out;
 	}
 
+	if (IS_ERR(fp)) {
+		fc_rport_error_retry(rport, fp);
+		goto err;
+	}
+
 	op = fc_frame_payload_op(fp);
 	if (op == ELS_LS_ACC) {
 		pp = fc_frame_payload_get(fp, sizeof(*pp));
@@ -678,17 +682,19 @@ static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
 	FC_DEBUG_RPORT("Received a LOGO response from port (%6x)\n",
 		       rport->port_id);
 
-	if (IS_ERR(fp)) {
-		fc_rport_error_retry(rport, fp);
-		goto err;
-	}
-
 	if (rdata->rp_state != RPORT_ST_LOGO) {
 		FC_DEBUG_RPORT("Received a LOGO response, but in state %s\n",
 			       fc_rport_state(rport));
+		if (IS_ERR(fp))
+			goto err;
 		goto out;
 	}
 
+	if (IS_ERR(fp)) {
+		fc_rport_error_retry(rport, fp);
+		goto err;
+	}
+
 	op = fc_frame_payload_op(fp);
 	if (op == ELS_LS_ACC) {
 		fc_rport_enter_rtv(rport);
@@ -764,17 +770,19 @@ static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
 	FC_DEBUG_RPORT("Received a RTV response from port (%6x)\n",
 		       rport->port_id);
 
-	if (IS_ERR(fp)) {
-		fc_rport_error(rport, fp);
-		goto err;
-	}
-
 	if (rdata->rp_state != RPORT_ST_RTV) {
 		FC_DBG("Received a RTV response, but in state %s\n",
 		       fc_rport_state(rport));
+		if (IS_ERR(fp))
+			goto err;
 		goto out;
 	}
 
+	if (IS_ERR(fp)) {
+		fc_rport_error(rport, fp);
+		goto err;
+	}
+
 	op = fc_frame_payload_op(fp);
 	if (op == ELS_LS_ACC) {
 		struct fc_els_rtv_acc *rtv;