[PATCH] libata-eh-fw: implement new EH scheduling via error completion

There are several ways a qc can get schedule for EH in new EH.  This
patch implements one of them - completing a qc with ATA_QCFLAG_FAILED
set or with non-zero qc->err_mask.  ALL such qc's are examined by EH.

New EH schedules a qc for EH from completion iff ->error_handler is
implemented, qc is marked as failed or qc->err_mask is non-zero and
the command is not an internal command (internal cmd is handled via
->post_internal_cmd).  The EH scheduling itself is performed by asking
SCSI midlayer to schedule EH for the specified scmd.

For drivers implementing old-EH, nothing changes.  As this change
makes ata_qc_complete() rather large, it's not inlined anymore and
__ata_qc_complete() is exported to other parts of libata for later
use.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 1 insertions, 26 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index bfcefdca0616..6023f324e68e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -605,7 +605,7 @@ extern void ata_bmdma_start (struct ata_queued_cmd *qc);
 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
 extern u8   ata_bmdma_status(struct ata_port *ap);
 extern void ata_bmdma_irq_clear(struct ata_port *ap);
-extern void __ata_qc_complete(struct ata_queued_cmd *qc);
+extern void ata_qc_complete(struct ata_queued_cmd *qc);
 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
                               void (*done)(struct scsi_cmnd *));
 extern int ata_std_bios_param(struct scsi_device *sdev,
@@ -883,31 +883,6 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
 }
 
 /**
- *      ata_qc_complete - Complete an active ATA command
- *      @qc: Command to complete
- *      @err_mask: ATA Status register contents
- *
- *      Indicate to the mid and upper layers that an ATA
- *      command has completed, with either an ok or not-ok status.
- *
- *      LOCKING:
- *      spin_lock_irqsave(host_set lock)
- */
-static inline void ata_qc_complete(struct ata_queued_cmd *qc)
-{
-        struct ata_port *ap = qc->ap;
-
-        if (unlikely(qc->flags & ATA_QCFLAG_EH_SCHEDULED))
-                return;
-
-        /* read result TF if failed or requested */
-        if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
-                ap->ops->tf_read(ap, &qc->result_tf);
-
-        __ata_qc_complete(qc);
-}
-
-/**
  *      ata_irq_on - Enable interrupts on a port.
  *      @ap: Port on which interrupts are enabled.
  *