libata: drop @finish_qc from ata_qc_complete_multiple()

ata_qc_complete_multiple() took @finish_qc and called it on every qc
before completing it.  This was to give opportunity to update TF cache
before ata_qc_complete() tries to fill result_tf.  Now that result TF
is a separate operation, this is no longer necessary.

Update sata_sil24, which was the only user of this mechanism, such
that it implements its own ops->qc_fill_rtf() and drop @finish_qc from
ata_qc_complete_multiple().
Signed-off-by: Tejun Heo <htejun@gmail.com>

drivers/ata/ahci.c

@@ -1696,7 +1696,7 @@ static void ahci_port_intr(struct ata_port *ap)
 	else
 		qc_active = readl(port_mmio + PORT_CMD_ISSUE);
 
-	rc = ata_qc_complete_multiple(ap, qc_active, NULL);
+	rc = ata_qc_complete_multiple(ap, qc_active);
 
 	/* while resetting, invalid completions are expected */
 	if (unlikely(rc < 0 && !resetting)) {

drivers/ata/libata-core.c

@@ -4673,7 +4673,6 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
  *	ata_qc_complete_multiple - Complete multiple qcs successfully
  *	@ap: port in question
  *	@qc_active: new qc_active mask
- *	@finish_qc: LLDD callback invoked before completing a qc
  *
  *	Complete in-flight commands.  This functions is meant to be
  *	called from low-level driver's interrupt routine to complete
@@ -4686,8 +4685,7 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
  *	RETURNS:
  *	Number of completed commands on success, -errno otherwise.
  */
-int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
-			     void (*finish_qc)(struct ata_queued_cmd *))
+int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
 {
 	int nr_done = 0;
 	u32 done_mask;
@@ -4708,8 +4706,6 @@ int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
 			continue;
 
 		if ((qc = ata_qc_from_tag(ap, i))) {
-			if (finish_qc)
-				finish_qc(qc);
 			ata_qc_complete(qc);
 			nr_done++;
 		}

drivers/ata/sata_sil24.c

@@ -348,6 +348,7 @@ static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
 static int sil24_qc_defer(struct ata_queued_cmd *qc);
 static void sil24_qc_prep(struct ata_queued_cmd *qc);
 static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc);
+static bool sil24_qc_fill_rtf(struct ata_queued_cmd *qc);
 static void sil24_pmp_attach(struct ata_port *ap);
 static void sil24_pmp_detach(struct ata_port *ap);
 static void sil24_freeze(struct ata_port *ap);
@@ -407,6 +408,7 @@ static struct ata_port_operations sil24_ops = {
 	.qc_defer		= sil24_qc_defer,
 	.qc_prep		= sil24_qc_prep,
 	.qc_issue		= sil24_qc_issue,
+	.qc_fill_rtf		= sil24_qc_fill_rtf,
 
 	.freeze			= sil24_freeze,
 	.thaw			= sil24_thaw,
@@ -914,6 +916,12 @@ static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc)
 	return 0;
 }
 
+static bool sil24_qc_fill_rtf(struct ata_queued_cmd *qc)
+{
+	sil24_read_tf(qc->ap, qc->tag, &qc->result_tf);
+	return true;
+}
+
 static void sil24_pmp_attach(struct ata_port *ap)
 {
 	sil24_config_pmp(ap, 1);
@@ -1098,15 +1106,6 @@ static void sil24_error_intr(struct ata_port *ap)
 	}
 }
 
-static void sil24_finish_qc(struct ata_queued_cmd *qc)
-{
-	struct ata_port *ap = qc->ap;
-	struct sil24_port_priv *pp = ap->private_data;
-
-	if (qc->flags & ATA_QCFLAG_RESULT_TF)
-		sil24_read_tf(ap, qc->tag, &pp->tf);
-}
-
 static inline void sil24_host_intr(struct ata_port *ap)
 {
 	void __iomem *port = ap->ioaddr.cmd_addr;
@@ -1131,7 +1130,7 @@ static inline void sil24_host_intr(struct ata_port *ap)
 	}
 
 	qc_active = slot_stat & ~HOST_SSTAT_ATTN;
-	rc = ata_qc_complete_multiple(ap, qc_active, sil24_finish_qc);
+	rc = ata_qc_complete_multiple(ap, qc_active);
 	if (rc > 0)
 		return;
 	if (rc < 0) {

include/linux/libata.h

@@ -924,8 +924,7 @@ extern void ata_id_string(const u16 *id, unsigned char *s,
 extern void ata_id_c_string(const u16 *id, unsigned char *s,
 			    unsigned int ofs, unsigned int len);
 extern void ata_qc_complete(struct ata_queued_cmd *qc);
-extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
-				    void (*finish_qc)(struct ata_queued_cmd *));
+extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active);
 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,