commit: 6868225e3e92399068be9a5f1635752d91012ad5
From: Lin Ming <[email protected]>
Date: Thu, 3 May 2012 22:15:07 +0800
Subject: 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 <[email protected]> # 2.6.37+
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Jeff Garzik <[email protected]>
---
drivers/ata/libata-eh.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index c61316e..d1fbd59 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -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)++;
--
1.7.3.4
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