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When ioread32() returns 0xFFFFFFFF, we should execute cleanup functions like other error handling paths before returning. Link: https://lore.kernel.org/r/20201225083520.22015-1-dinghao.liu@zju.edu.cn Acked-by: Karan Tilak Kumar <kartilak@cisco.com> Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>