scsi: qla2xxx: Prevent multiple ADISC commands per session
Add check to allow 1 discovery command per session to be sent. Signed-off-by: NQuinn Tran <qtran@marvell.com> Signed-off-by: NHimanshu Madhani <hmadhani@marvell.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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