patch 3/8:
Change the state after "PIO data-in" to HSM_ST_IDLE instead of HSM_ST_LAST.
This can prevent the irq handler from thinking "HSM is waiting for the last irq"
and submitting redundant tasks to the workqueue.
Signed-off-by: Albert Lee <albertcc@xxxxxxxxxx>
---
This patch is needed if irq driven pio to be delegated to workqueue.
diff -Nrup 02_smart_flush/drivers/ata/libata-core.c 03_read_state/drivers/ata/libata-core.c
--- 02_smart_flush/drivers/ata/libata-core.c 2007-05-16 10:37:53.000000000 +0800
+++ 03_read_state/drivers/ata/libata-core.c 2007-05-16 10:37:57.000000000 +0800
@@ -4453,7 +4453,7 @@ static void ata_pio_sector(struct ata_qu
unsigned char *buf;
if (qc->curbytes == qc->nbytes - qc->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;
@@ -4807,6 +4807,8 @@ 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);
@@ -4964,8 +4966,7 @@ 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 */
status = ata_wait_idle(ap);
goto fsm_start;
@@ -4976,6 +4977,7 @@ 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;
-
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