Implement EH helper ata_eh_determine_qc(). This function determines
which is the offending qc and loads TF registers for the qc.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/scsi/libata-core.c | 1 +
drivers/scsi/libata-eh.c | 24 ++++++++++++++++++++++++
include/linux/libata.h | 2 ++
3 files changed, 27 insertions(+), 0 deletions(-)
96065c0f71d63ac4bb80855a432b2c435db73765
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 13954f6..a4456bd 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -5342,3 +5342,4 @@ EXPORT_SYMBOL_GPL(ata_eng_timeout);
EXPORT_SYMBOL_GPL(ata_eh_schedule_port);
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
+EXPORT_SYMBOL_GPL(ata_eh_determine_qc);
diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index 7ef2b78..8a1a4c7 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -558,3 +558,27 @@ static unsigned int atapi_eh_request_sen
return ata_exec_internal(ap, dev, &tf, cdb, DMA_FROM_DEVICE,
sense_buf, SCSI_SENSE_BUFFERSIZE);
}
+
+/**
+ * ata_eh_determine_qc - Determine which qc caused error
+ * @ap: port which failed
+ * @tf: resulting taskfile registers of the failed command
+ *
+ * Determine which qc caused failure and read associated tf
+ * registers.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep)
+ *
+ * RETURNS:
+ * Pointer to the failed qc.
+ */
+struct ata_queued_cmd * ata_eh_determine_qc(struct ata_port *ap,
+ struct ata_taskfile *tf)
+{
+ memset(tf, 0, sizeof(*tf));
+ ap->ops->tf_read(ap, tf);
+
+ return __ata_qc_from_tag(ap, ap->active_tag);
+}
+
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 9447bd2..6376379 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -688,6 +688,8 @@ extern void ata_eng_timeout(struct ata_p
extern void ata_eh_schedule_port(struct ata_port *ap, unsigned int flags);
extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
+extern struct ata_queued_cmd * ata_eh_determine_qc(struct ata_port *ap,
+ struct ata_taskfile *tf);
static inline int
--
1.2.4
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