From: Tejun Heo <htejun@gmail.com>
Date: Mon, 15 May 2006 11:59:29 +0000 (+0900)
Subject: [PATCH] libata: fix irq-pio merge
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c17ea20d9a689d7335e97e09354865cdd9f873e1;p=openwrt%2Fstaging%2Fblogic.git

[PATCH] libata: fix irq-pio merge

* kill ata_poll_qc_complete() and implement/use ata_hsm_qc_complete()
  which completes qcs in new EH compliant manner from HSM

* don't print error message from ata_hsm_move().  it's responsibility
  of EH.

* kill ATA_FLAG_NOINTR usage in bmdma EH

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

diff --git a/drivers/scsi/libata-bmdma.c b/drivers/scsi/libata-bmdma.c
index 49eff18a67e3..6d30d2c52960 100644
--- a/drivers/scsi/libata-bmdma.c
+++ b/drivers/scsi/libata-bmdma.c
@@ -726,7 +726,6 @@ void ata_bmdma_drive_eh(struct ata_port *ap, ata_reset_fn_t softreset,
 	/* reset PIO HSM and stop DMA engine */
 	spin_lock_irqsave(&host_set->lock, flags);
 
-	ap->flags &= ~ATA_FLAG_NOINTR;
 	ap->hsm_task_state = HSM_ST_IDLE;
 
 	if (qc && (qc->tf.protocol == ATA_PROT_DMA ||
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index c859b96b891a..487b8f22981f 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -3461,40 +3461,6 @@ skip_map:
 	return 0;
 }
 
-/**
- *	ata_poll_qc_complete - turn irq back on and finish qc
- *	@qc: Command to complete
- *	@err_mask: ATA status register content
- *
- *	LOCKING:
- *	None.  (grabs host lock)
- */
-void ata_poll_qc_complete(struct ata_queued_cmd *qc)
-{
-	struct ata_port *ap = qc->ap;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ap->host_set->lock, flags);
-
-	if (ap->ops->error_handler) {
-		/* EH might have kicked in while host_set lock is released */
-		qc = ata_qc_from_tag(ap, qc->tag);
-		if (qc) {
-			if (!(qc->err_mask & AC_ERR_HSM)) {
-				ata_irq_on(ap);
-				ata_qc_complete(qc);
-			} else
-				ata_port_freeze(ap);
-		}
-	} else {
-		/* old EH */
-		ata_irq_on(ap);
-		ata_qc_complete(qc);
-	}
-
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
-}
-
 /**
  *	swap_buf_le16 - swap halves of 16-bit words in place
  *	@buf:  Buffer to swap
@@ -3917,6 +3883,56 @@ static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *q
 	return 0;
 }
 
+/**
+ *	ata_hsm_qc_complete - finish a qc running on standard HSM
+ *	@qc: Command to complete
+ *	@in_wq: 1 if called from workqueue, 0 otherwise
+ *
+ *	Finish @qc which is running on standard HSM.
+ *
+ *	LOCKING:
+ *	If @in_wq is zero, spin_lock_irqsave(host_set lock).
+ *	Otherwise, none on entry and grabs host lock.
+ */
+static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned long flags;
+
+	if (ap->ops->error_handler) {
+		if (in_wq) {
+			spin_lock_irqsave(&ap->host_set->lock, flags);
+
+			/* EH might have kicked in while host_set lock
+			 * is released.
+			 */
+			qc = ata_qc_from_tag(ap, qc->tag);
+			if (qc) {
+				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
+					ata_irq_on(ap);
+					ata_qc_complete(qc);
+				} else
+					ata_port_freeze(ap);
+			}
+
+			spin_unlock_irqrestore(&ap->host_set->lock, flags);
+		} else {
+			if (likely(!(qc->err_mask & AC_ERR_HSM)))
+				ata_qc_complete(qc);
+			else
+				ata_port_freeze(ap);
+		}
+	} else {
+		if (in_wq) {
+			spin_lock_irqsave(&ap->host_set->lock, flags);
+			ata_irq_on(ap);
+			ata_qc_complete(qc);
+			spin_unlock_irqrestore(&ap->host_set->lock, flags);
+		} else
+			ata_qc_complete(qc);
+	}
+}
+
 /**
  *	ata_hsm_move - move the HSM to the next state.
  *	@ap: the target ata_port
@@ -4108,19 +4124,12 @@ fsm_start:
 		ap->hsm_task_state = HSM_ST_IDLE;
 
 		/* complete taskfile transaction */
-		if (in_wq)
-			ata_poll_qc_complete(qc);
-		else
-			ata_qc_complete(qc);
+		ata_hsm_qc_complete(qc, in_wq);
 
 		poll_next = 0;
 		break;
 
 	case HSM_ST_ERR:
-		if (qc->tf.command != ATA_CMD_PACKET)
-			printk(KERN_ERR "ata%u: dev %u command error, drv_stat 0x%x\n",
-			       ap->id, qc->dev->devno, status);
-
 		/* make sure qc->err_mask is available to
 		 * know what's wrong and recover
 		 */
@@ -4129,10 +4138,7 @@ fsm_start:
 		ap->hsm_task_state = HSM_ST_IDLE;
 
 		/* complete taskfile transaction */
-		if (in_wq)
-			ata_poll_qc_complete(qc);
-		else
-			ata_qc_complete(qc);
+		ata_hsm_qc_complete(qc, in_wq);
 
 		poll_next = 0;
 		break;