[PATCH 1/7] libata: set the state after "PIO data-in" to HSM_ST_IDLE instead of HSM_ST_LAST

[Albert Lee <albertcc@tw.ibm.com>]

patch 1/7:
  Set the state after "PIO data-in" to HSM_ST_IDLE instead of HSM_ST_LAST.
To prevent the irq handler from thinking "HSM is waiting for the last irq".
Needed later when part of the irq driven pio pushed out to workqueue.

---

diff -Nrup 00_linux-2.6.21.1/drivers/ata/libata-core.c 01_last_idle/drivers/ata/libata-core.c
--- 00_linux-2.6.21.1/drivers/ata/libata-core.c	2007-05-04 11:22:23.000000000 +0800
+++ 01_last_idle/drivers/ata/libata-core.c	2007-05-11 10:24:16.000000000 +0800
@@ -4041,7 +4041,7 @@ static void ata_pio_sector(struct ata_qu
 	unsigned char *buf;
 
 	if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
-		ap->hsm_task_state = HSM_ST_LAST;
+		ap->hsm_task_state = do_write ? HSM_ST_LAST : HSM_ST_IDLE;
 
 	page = sg[qc->cursg].page;
 	offset = sg[qc->cursg].offset + qc->cursg_ofs;
@@ -4389,6 +4389,8 @@ int ata_hsm_move(struct ata_port *ap, st
 	 */
 	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
 
+	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
+
 fsm_start:
 	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
 		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
@@ -4548,8 +4550,7 @@ fsm_start:
 
 			ata_pio_sectors(qc);
 
-			if (ap->hsm_task_state == HSM_ST_LAST &&
-			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
+			if (ap->hsm_task_state == HSM_ST_IDLE) {
 				/* all data read */
 				ata_altstatus(ap);
 				status = ata_wait_idle(ap);
@@ -4562,6 +4563,7 @@ fsm_start:
 		break;
 
 	case HSM_ST_LAST:
+	case HSM_ST_IDLE:
 		if (unlikely(!ata_ok(status))) {
 			qc->err_mask |= __ac_err_mask(status);
 			ap->hsm_task_state = HSM_ST_ERR;