scsi: hpsa: limit outstanding rescans
Avoid rescan storms. No need to queue another if one is pending. Reviewed-by: NScott Benesh <scott.benesh@microsemi.com> Reviewed-by: NScott Teel <scott.teel@microsemi.com> Reviewed-by: NTomas Henzl <thenzl@redhat.com> Signed-off-by: NDon Brace <don.brace@microsemi.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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