libata: implement and use ATA_QCFLAG_QUIET

Implement ATA_QCFLAG_QUIET which indicates that there's no need to
report if the command fails with AC_ERR_DEV and set it for passthrough
commands.

Combined with previous changes, this now makes device errors for all
direct commands reported directly to the issuer without going through
EH actions and reporting.

Note that EH is still invoked after non-IO device errors to determine
the nature of the error and resume command execution (some controller
requires special care after error to continue).  It just performs
default maintenance after error, examines what's going on, realizes
that it's none of its business and reports the command failure without
logging any error messages.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 6 insertions, 3 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 3c6ad7d949c1..8d64f8fd8f1d 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1878,7 +1878,9 @@ static void ata_eh_link_report(struct ata_link *link)
         for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
                 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
 
-                if (!(qc->flags & ATA_QCFLAG_FAILED) || qc->dev->link != link)
+                if (!(qc->flags & ATA_QCFLAG_FAILED) || qc->dev->link != link ||
+                    ((qc->flags & ATA_QCFLAG_QUIET) &&
+                     qc->err_mask == AC_ERR_DEV))
                         continue;
                 if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
                         continue;
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 6ef5ecb917ce..fc89590d3772 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2767,8 +2767,8 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
          */
         qc->nbytes = scsi_bufflen(scmd);
 
-        /* request result TF */
-        qc->flags |= ATA_QCFLAG_RESULT_TF;
+        /* request result TF and be quiet about device error */
+        qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
 
         return 0;
 
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 147ccc40c8af..1e277852ba42 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -221,6 +221,7 @@ enum {
         ATA_QCFLAG_IO           = (1 << 3), /* standard IO command */
         ATA_QCFLAG_RESULT_TF    = (1 << 4), /* result TF requested */
         ATA_QCFLAG_CLEAR_EXCL   = (1 << 5), /* clear excl_link on completion */
+        ATA_QCFLAG_QUIET        = (1 << 6), /* don't report device error */
 
         ATA_QCFLAG_FAILED       = (1 << 16), /* cmd failed and is owned by EH */
         ATA_QCFLAG_SENSE_VALID  = (1 << 17), /* sense data valid */