[PATCH 5.18 0969/1095] scsi: qla2xxx: Fix losing target when it reappears during delete

Greg Kroah-Hartman
2022-08-15T23:09:58Z

From: Arun Easi <aeasi@marvell.com>

commit 118b0c863c8f5629cc5271fc24d72d926e0715d9 upstream.

FC target disappeared during port perturbation tests due to a race that
tramples target state. Fix the issue by adding state checks before
proceeding.

Link: https://lore.kernel.org/r/20220616053508.27186-8-njavali@marvell.com
Fixes: 44c57f205876 ("scsi: qla2xxx: Changes to support FCP2 Target")
Cc: stable@vger.kernel.org
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/qla2xxx/qla_attr.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -2716,17 +2716,24 @@ qla2x00_dev_loss_tmo_callbk(struct fc_rp
if (!fcport)
return;

- /* Now that the rport has been deleted, set the fcport state to
- FCS_DEVICE_DEAD */
- qla2x00_set_fcport_state(fcport, FCS_DEVICE_DEAD);
+
+ /*
+ * Now that the rport has been deleted, set the fcport state to
+ * FCS_DEVICE_DEAD, if the fcport is still lost.
+ */
+ if (fcport->scan_state != QLA_FCPORT_FOUND)
+ qla2x00_set_fcport_state(fcport, FCS_DEVICE_DEAD);

/*
* Transport has effectively 'deleted' the rport, clear
* all local references.
*/
spin_lock_irqsave(host->host_lock, flags);
- fcport->rport = fcport->drport = NULL;
- *((fc_port_t **)rport->dd_data) = NULL;
+ /* Confirm port has not reappeared before clearing pointers. */
+ if (rport->port_state != FC_PORTSTATE_ONLINE) {
+ fcport->rport = fcport->drport = NULL;
+ *((fc_port_t **)rport->dd_data) = NULL;
+ }
spin_unlock_irqrestore(host->host_lock, flags);

if (test_bit(ABORT_ISP_ACTIVE, &fcport->vha->dpc_flags))
@@ -2759,9 +2766,12 @@ qla2x00_terminate_rport_io(struct fc_rpo
/*
* At this point all fcport's software-states are cleared. Perform any
* final cleanup of firmware resources (PCBs and XCBs).
+ *
+ * Attempt to cleanup only lost devices.
*/
if (fcport->loop_id != FC_NO_LOOP_ID) {
- if (IS_FWI2_CAPABLE(fcport->vha->hw)) {
+ if (IS_FWI2_CAPABLE(fcport->vha->hw) &&
+ fcport->scan_state != QLA_FCPORT_FOUND) {
if (fcport->loop_id != FC_NO_LOOP_ID)
fcport->logout_on_delete = 1;

@@ -2771,7 +2781,7 @@ qla2x00_terminate_rport_io(struct fc_rpo
__LINE__);
qlt_schedule_sess_for_deletion(fcport);
}
- } else {
+ } else if (!IS_FWI2_CAPABLE(fcport->vha->hw)) {
qla2x00_port_logout(fcport->vha, fcport);
}
}