scsi: qla2xxx: Fix abort command deadlock due to spinlock

Original code acquires hardware_lock to add Abort IOCB onto driver
request queue for processing. However, abort_command() will also acquire
hardware lock to look up sp pointer before issuing abort IOCB command
resulting into a deadlock. This patch safely removes the possible
deadlock scenario by removing extra spinlock.

Fixes: 6eb54715b54bb ("qla2xxx: Added interface to send explicit LOGO.")
Cc: <stable@vger.kernel.org> # 4.10+
Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index d810a44..106f4ac 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -2394,7 +2394,6 @@ qla2x00_els_dcmd_iocb_timeout(void *data)
        struct scsi_qla_host *vha = sp->vha;
        struct qla_hw_data *ha = vha->hw;
        struct srb_iocb *lio = &sp->u.iocb_cmd;
-       unsigned long flags = 0;
 
        ql_dbg(ql_dbg_io, vha, 0x3069,
            "%s Timeout, hdl=%x, portid=%02x%02x%02x\n",
@@ -2402,7 +2401,6 @@ qla2x00_els_dcmd_iocb_timeout(void *data)
            fcport->d_id.b.al_pa);
 
        /* Abort the exchange */
-       spin_lock_irqsave(&ha->hardware_lock, flags);
        if (ha->isp_ops->abort_command(sp)) {
                ql_dbg(ql_dbg_io, vha, 0x3070,
                    "mbx abort_command failed.\n");
@@ -2410,7 +2408,6 @@ qla2x00_els_dcmd_iocb_timeout(void *data)
                ql_dbg(ql_dbg_io, vha, 0x3071,
                    "mbx abort_command success.\n");
        }
-       spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
        complete(&lio->u.els_logo.comp);
 }