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libata: skip old error history when counting probe trials 

Commit d902747("[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: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Lin Ming 2012-05-03 22:15:07 +08:00 committed by Jeff Garzik
parent 69964ea4c7
commit 6868225e3e
1 changed files with 2 additions and 1 deletions
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3
drivers/ata/libata-eh.c
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@ -3501,7 +3501,8 @@ static int ata_count_probe_trials_cb(struct ata_ering_entry *ent, void *void_arg
u64 now = get_jiffies_64();
int *trials = void_arg;
if (ent->timestamp < now - min(now, interval))
if ((ent->eflags & ATA_EFLAG_OLD_ER) ||
(ent->timestamp < now - min(now, interval)))
return -1;
(*trials)++;