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    libata: skip old error history when counting probe trials · 6868225e
    Lin Ming 提交于
    Commit d9027470("[libata] Add ATA transport class") introduced
    ATA_EFLAG_OLD_ER to mark entries in the error ring as cleared.
    
    But ata_count_probe_trials_cb() didn't check this flag and it still
    counts the old error history. So wrong probe trials count is returned
    and it causes problem, for example, SATA link speed is slowed down from
    3.0Gbps to 1.5Gbps.
    
    Fix it by checking ATA_EFLAG_OLD_ER in ata_count_probe_trials_cb().
    
    Cc: stable <stable@vger.kernel.org> # 2.6.37+
    Signed-off-by: NLin Ming <ming.m.lin@intel.com>
    Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
    6868225e
libata-eh.c 105.8 KB