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authorLin Ming <ming.m.lin@intel.com>2012-05-03 22:15:07 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-07 08:56:39 -0700
commit9051b1e1aed62944eb634c3a85fad76353e5fa05 (patch)
parentad567d13573186f184fb4a2ec0d3a1ca94baedbb (diff)
libata: skip old error history when counting probe trials
commit 6868225e3e92399068be9a5f1635752d91012ad5 upstream. 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(). Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 7f099d6e4e0b..311c92d1db25 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -3487,7 +3487,8 @@ 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;