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scsi: megaraid_sas: add retry logic in megasas_readl
Due to hardware errata in Aero controllers, reads to certain fusion registers could intermittently return zero. This behavior is transient in nature and subsequent reads will return valid value. For Aero controllers, any calls to readl to read from certain registers will be retried for maximum three times, if read returns zero. Signed-off-by: Shivasharan S <[email protected]> Signed-off-by: Martin K. Petersen <[email protected]>
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