qla2xxx: Fix hardware lock/unlock issue causing kernel panic.

[ Upstream commit ef86cb2059a14b4024c7320999ee58e938873032 ]

This patch fixes a kernel panic for qla2xxx Target core
Module driver introduced by a fix in the qla2xxx initiator code.

Commit ef86cb2 ("qla2xxx: Mark port lost when we receive an RSCN for it.")
introduced the regression for qla2xxx Target driver.

Stack trace will have following signature

 --- <NMI exception stack> ---
[ffff88081faa3cc8] _raw_spin_lock_irqsave at ffffffff815b1f03
[ffff88081faa3cd0] qlt_fc_port_deleted at ffffffffa096ccd0 [qla2xxx]
[ffff88081faa3d20] qla2x00_schedule_rport_del at ffffffffa0913831[qla2xxx]
[ffff88081faa3d50] qla2x00_mark_device_lost at ffffffffa09159c5[qla2xxx]
[ffff88081faa3db0] qla2x00_async_event at ffffffffa0938d59 [qla2xxx]
[ffff88081faa3e30] qla24xx_msix_default at ffffffffa093a326 [qla2xxx]
[ffff88081faa3e90] handle_irq_event_percpu at ffffffff810a7b8d
[ffff88081faa3ee0] handle_irq_event at ffffffff810a7d32
[ffff88081faa3f10] handle_edge_irq at ffffffff810ab6b9
[ffff88081faa3f30] handle_irq at ffffffff8100619c
[ffff88081faa3f70] do_IRQ at ffffffff815b4b1c
 --- <IRQ stack> ---

Cc: <stable@vger.kernel.org> # v3.18+
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 6640131..6c302c4 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -2924,6 +2924,7 @@ qla2x00_rport_del(void *data)
        struct fc_rport *rport;
        scsi_qla_host_t *vha = fcport->vha;
        unsigned long flags;
+       unsigned long vha_flags;
 
        spin_lock_irqsave(fcport->vha->host->host_lock, flags);
        rport = fcport->drport ? fcport->drport: fcport->rport;
@@ -2935,7 +2936,9 @@ qla2x00_rport_del(void *data)
                 * Release the target mode FC NEXUS in qla_target.c code
                 * if target mod is enabled.
                 */
+               spin_lock_irqsave(&vha->hw->hardware_lock, vha_flags);
                qlt_fc_port_deleted(vha, fcport);
+               spin_unlock_irqrestore(&vha->hw->hardware_lock, vha_flags);
        }
 }
 
@@ -3303,6 +3306,7 @@ qla2x00_reg_remote_port(scsi_qla_host_t *vha, fc_port_t *fcport)
         * Create target mode FC NEXUS in qla_target.c if target mode is
         * enabled..
         */
+
        qlt_fc_port_added(vha, fcport);
 
        spin_lock_irqsave(fcport->vha->host->host_lock, flags);

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index b749026..bce2bea 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -782,10 +782,8 @@ void qlt_fc_port_added(struct scsi_qla_host *vha, fc_port_t *fcport)
 
 void qlt_fc_port_deleted(struct scsi_qla_host *vha, fc_port_t *fcport)
 {
-       struct qla_hw_data *ha = vha->hw;
        struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
        struct qla_tgt_sess *sess;
-       unsigned long flags;
 
        if (!vha->hw->tgt.tgt_ops)
                return;
@@ -793,14 +791,11 @@ void qlt_fc_port_deleted(struct scsi_qla_host *vha, fc_port_t *fcport)
        if (!tgt || (fcport->port_type != FCT_INITIATOR))
                return;
 
-       spin_lock_irqsave(&ha->hardware_lock, flags);
        if (tgt->tgt_stop) {
-               spin_unlock_irqrestore(&ha->hardware_lock, flags);
                return;
        }
        sess = qlt_find_sess_by_port_name(tgt, fcport->port_name);
        if (!sess) {
-               spin_unlock_irqrestore(&ha->hardware_lock, flags);
                return;
        }
 
@@ -808,7 +803,6 @@ void qlt_fc_port_deleted(struct scsi_qla_host *vha, fc_port_t *fcport)
 
        sess->local = 1;
        qlt_schedule_sess_for_deletion(sess, false);
-       spin_unlock_irqrestore(&ha->hardware_lock, flags);
 }
 
 static inline int test_tgt_sess_count(struct qla_tgt *tgt)