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scsi: libiscsi: Fix locking in __iscsi_conn_send_pdu 

The code at free_task label in __iscsi_conn_send_pdu can get executed
from blk_timeout_work which takes queue_lock using spin_lock_irq.
back_lock taken with spin_unlock_bh will cause WARN_ON_ONCE.  The code
gets executed either with bottom half or IRQ disabled hence using
spin_lock/spin_unlock for back_lock is safe.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Jitendra Bhivare 2016-10-13 12:08:48 +05:30 committed by Martin K. Petersen
parent 8a4236a2c7
commit 4fa507992f
1 changed files with 2 additions and 2 deletions
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4
drivers/scsi/libiscsi.c
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@ -791,9 +791,9 @@ __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
free_task:
/* regular RX path uses back_lock */
spin_lock_bh(&session->back_lock);
spin_lock(&session->back_lock);
__iscsi_put_task(task);
spin_unlock_bh(&session->back_lock);
spin_unlock(&session->back_lock);
return NULL;
}