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scsi: qla2xxx: Spinlock recursion in qla_target 

The patch reverts changes done in qlt_schedule_sess_for_deletion() to
avoid spinlock recursion sess->vha->work_lock should be used instead
of ha->tgt.sess_lock, that can be locked in callers: qlt_reset() or
qlt_handle_login()

[mkp: roll in build warning reported by sfr]

Fixes: 1c6cacf4ea ("scsi: qla2xxx: Fixup locking for session deletion")
Cc: <stable@vger.kernel.org> #v4.17
Signed-off-by: Mikhail Malygin <m.malygin@yadro.com>
Reported-by: Mikhail Malygin <m.malygin@yadro.com>
Tested-by: Mikhail Malygin <m.malygin@yadro.com>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mikhail Malygin 2018-06-13 13:05:57 +00:00 committed by Martin K. Petersen
parent f2233a33dc
commit 49d7bd3681
1 changed files with 3 additions and 4 deletions
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7
drivers/scsi/qla2xxx/qla_target.c
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@ -1224,7 +1224,6 @@ static void qla24xx_chk_fcp_state(struct fc_port *sess)
void qlt_schedule_sess_for_deletion(struct fc_port *sess)
{
struct qla_tgt *tgt = sess->tgt;
struct qla_hw_data *ha = sess->vha->hw;
unsigned long flags;
if (sess->disc_state == DSC_DELETE_PEND)
@ -1241,16 +1240,16 @@ void qlt_schedule_sess_for_deletion(struct fc_port *sess)
return;
}
spin_lock_irqsave(&ha->tgt.sess_lock, flags);
if (sess->deleted == QLA_SESS_DELETED)
sess->logout_on_delete = 0;
spin_lock_irqsave(&sess->vha->work_lock, flags);
if (sess->deleted == QLA_SESS_DELETION_IN_PROGRESS) {
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
spin_unlock_irqrestore(&sess->vha->work_lock, flags);
return;
}
sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
spin_unlock_irqrestore(&sess->vha->work_lock, flags);
sess->disc_state = DSC_DELETE_PEND;