From: Hannes Reinecke <hare@xxxxxxxx>
The fc_rport_priv structure is reference counted, so we need to
ensure that the reference is increased before accessing the structure.
Signed-off-by: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Saurav Kashyap <skashyap@xxxxxxxxxxx>
---
drivers/scsi/qedf/qedf_els.c | 9 ++++++++-
drivers/scsi/qedf/qedf_io.c | 25 +++++++++++++++++--------
drivers/scsi/qedf/qedf_main.c | 5 +++++
3 files changed, 30 insertions(+), 9 deletions(-)
diff --git a/drivers/scsi/qedf/qedf_els.c b/drivers/scsi/qedf/qedf_els.c
index f1f57637..1781e73 100644
--- a/drivers/scsi/qedf/qedf_els.c
+++ b/drivers/scsi/qedf/qedf_els.c
@@ -378,12 +378,18 @@ void qedf_restart_rport(struct qedf_rport *fcport)
spin_unlock_irqrestore(&fcport->rport_lock, flags);
rdata = fcport->rdata;
- if (rdata) {
+ if (rdata && !kref_get_unless_zero(&rdata->kref)) {
+ fcport->rdata = NULL;
+ rdata = NULL;
+ }
+
+ if (rdata && rdata->rp_state == RPORT_ST_READY) {
lport = fcport->qedf->lport;
port_id = rdata->ids.port_id;
QEDF_ERR(&(fcport->qedf->dbg_ctx),
"LOGO port_id=%x.\n", port_id);
fc_rport_logoff(rdata);
+ kref_put(&rdata->kref, fc_rport_destroy);
mutex_lock(&lport->disc.disc_mutex);
/* Recreate the rport and log back in */
rdata = fc_rport_create(lport, port_id);
@@ -393,6 +399,7 @@ void qedf_restart_rport(struct qedf_rport *fcport)
fcport->rdata = rdata;
} else {
mutex_unlock(&lport->disc.disc_mutex);
+ fcport->rdata = NULL;
}
}
clear_bit(QEDF_RPORT_IN_RESET, &fcport->flags);
diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c
index 57c3aa4..56d2116 100644
--- a/drivers/scsi/qedf/qedf_io.c
+++ b/drivers/scsi/qedf/qedf_io.c
@@ -1799,6 +1799,7 @@ int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
goto out;
}
+ qedf = fcport->qedf;
rdata = fcport->rdata;
if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
@@ -1808,32 +1809,31 @@ int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
}
r_a_tov = rdata->r_a_tov;
- qedf = fcport->qedf;
lport = qedf->lport;
if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
rc = 1;
- goto out;
+ goto drop_rdata_kref;
}
if (atomic_read(&qedf->link_down_tmo_valid) > 0) {
QEDF_ERR(&(qedf->dbg_ctx), "link_down_tmo active.\n");
rc = 1;
- goto out;
+ goto drop_rdata_kref;
}
/* Ensure room on SQ */
if (!atomic_read(&fcport->free_sqes)) {
QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
rc = 1;
- goto out;
+ goto drop_rdata_kref;
}
if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
QEDF_ERR(&qedf->dbg_ctx, "fcport is uploading.\n");
rc = 1;
- goto out;
+ goto drop_rdata_kref;
}
if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
@@ -1843,7 +1843,7 @@ int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
"cleanup or abort processing or already "
"completed.\n", io_req->xid);
rc = 1;
- goto out;
+ goto drop_rdata_kref;
}
kref_get(&io_req->refcount);
@@ -1876,6 +1876,8 @@ int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
spin_unlock_irqrestore(&fcport->rport_lock, flags);
+drop_rdata_kref:
+ kref_put(&rdata->kref, fc_rport_destroy);
out:
return rc;
}
@@ -2217,6 +2219,7 @@ 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");
@@ -2230,8 +2233,13 @@ static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
return FAILED;
}
- QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "portid = 0x%x "
- "tm_flags = %d\n", fcport->rdata->ids.port_id, tm_flags);
+ if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
+ QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM, "stale rport\n");
+ return FAILED;
+ }
+ 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) {
@@ -2327,6 +2335,7 @@ static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
rc = SUCCESS;
}
reset_tmf_err:
+ kref_put(&rdata->kref, fc_rport_destroy);
return rc;
}
diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index f82b0b5..3f42684 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -1333,6 +1333,8 @@ static void qedf_upload_connection(struct qedf_ctx *qedf,
static void qedf_cleanup_fcport(struct qedf_ctx *qedf,
struct qedf_rport *fcport)
{
+ struct fc_rport_priv *rdata = fcport->rdata;
+
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_CONN, "Cleaning up portid=%06x.\n",
fcport->rdata->ids.port_id);
@@ -1344,6 +1346,7 @@ static void qedf_cleanup_fcport(struct qedf_ctx *qedf,
qedf_free_sq(qedf, fcport);
fcport->rdata = NULL;
fcport->qedf = NULL;
+ kref_put(&rdata->kref, fc_rport_destroy);
}
/**
@@ -1419,6 +1422,8 @@ static void qedf_rport_event_handler(struct fc_lport *lport,
break;
}
+ /* Initial reference held on entry, so this can't fail */
+ kref_get(&rdata->kref);
fcport->rdata = rdata;
fcport->rport = rport;
--
1.8.3.1
