[24/26] qedf: Correctly handle refcounting of rdata.

Commit Message

Saurav Kashyap March 5, 2019, 10:58 a.m. UTC

- handle refcount of rdata during error conditions.

Signed-off-by: Saurav Kashyap <[e-mail]>
---
 drivers/scsi/qedf/qedf_io.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

Patch

diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c
index d98f5f4..b9877f1 100644
--- a/drivers/scsi/qedf/qedf_io.c
+++ b/drivers/scsi/qedf/qedf_io.c
@@ -2241,7 +2241,6 @@  static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
 	unsigned long flags;
 	struct fcoe_wqe *sqe;
 	u16 sqe_idx;
-	struct fc_rport_priv *rdata = fcport->rdata;
 
 	if (!sc_cmd) {
 		QEDF_ERR(&(qedf->dbg_ctx), "invalid arg\n");
@@ -2252,22 +2251,14 @@  static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
 	if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
 		QEDF_ERR(&(qedf->dbg_ctx), "fcport not offloaded\n");
 		rc = FAILED;
-		return FAILED;
-	}
-
-	if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
-		QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM, "stale rport\n");
-		return FAILED;
+		goto no_flush;
 	}
-	QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
-		  "portid = 0x%x tm_flags = %d\n",
-		  rdata->ids.port_id, tm_flags);
 
 	io_req = qedf_alloc_cmd(fcport, QEDF_TASK_MGMT_CMD);
 	if (!io_req) {
 		QEDF_ERR(&(qedf->dbg_ctx), "Failed TMF");
 		rc = -EAGAIN;
-		goto reset_tmf_err;
+		goto no_flush;
 	}
 
 	if (tm_flags == FCP_TMF_LUN_RESET)
@@ -2356,8 +2347,6 @@  static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
 		QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command success...\n");
 		rc = SUCCESS;
 	}
-reset_tmf_err:
-	kref_put(&rdata->kref, fc_rport_destroy);
 	return rc;
 }
 
@@ -2405,7 +2394,7 @@  int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 
 	rc = fc_block_scsi_eh(sc_cmd);
 	if (rc)
-		return rc;
+		goto tmf_err;
 
 	if (!fcport) {
 		QEDF_ERR(NULL, "device_reset: rport is NULL\n");
@@ -2442,7 +2431,13 @@  int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 	}
 
 	if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
-		QEDF_ERR(&qedf->dbg_ctx, "fcport is uploading.\n");
+		if (!fcport->rdata)
+			QEDF_ERR(&qedf->dbg_ctx, "fcport %p is uploading.\n",
+				 fcport);
+		else
+			QEDF_ERR(&qedf->dbg_ctx,
+				 "fcport %p port_id=%06x is uploading.\n",
+				 fcport, fcport->rdata->ids.port_id);
 		rc = FAILED;
 		goto tmf_err;
 	}
@@ -2450,6 +2445,7 @@  int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 	rc = qedf_execute_tmf(fcport, sc_cmd, tm_flags);
 
 tmf_err:
+	kref_put(&rdata->kref, fc_rport_destroy);
 	return rc;
 }