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[PATCH] libata irq-pio: cleanup ata_qc_issue_prot()

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ata_qc_issue_prot():
    - cleanup and let the PIO data out case always go through the
ata_dataout_task() codepath.
      (Previously for PIO data out case, 2 code pathes were used
        - irq case goes through ata_data_out_task() codepath.
        - polling case jumps over the HSM_ST_FIRST state and goes to
HSM_ST and ata_pio_task() directly.)

  ata_dataout_task():
    - rearrange the queue_work() code to handle the PIO data out +
polling case.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Albert Lee 2005-09-30 19:14:19 +08:00 committed by Jeff Garzik
parent 86a7397cda
commit 54f0038956
1 changed files with 21 additions and 21 deletions
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42
drivers/scsi/libata-core.c
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@ -3407,24 +3407,24 @@ int ata_qc_issue_prot(struct ata_queued_cmd *qc)
ata_tf_to_host_nolock(ap, &qc->tf);
if (qc->tf.flags & ATA_TFLAG_POLLING) {
/* polling PIO */
ap->hsm_task_state = HSM_ST;
queue_work(ata_wq, &ap->pio_task);
if (qc->tf.flags & ATA_TFLAG_WRITE) {
/* PIO data out protocol */
ap->hsm_task_state = HSM_ST_FIRST;
queue_work(ata_wq, &ap->dataout_task);
/* always send first data block using
* the ata_dataout_task() codepath.
*/
} else {
/* interrupt driven PIO */
if (qc->tf.flags & ATA_TFLAG_WRITE) {
/* PIO data out protocol */
ap->hsm_task_state = HSM_ST_FIRST;
queue_work(ata_wq, &ap->dataout_task);
/* PIO data in protocol */
ap->hsm_task_state = HSM_ST;
/* send first data block by polling */
} else {
/* PIO data in protocol */
ap->hsm_task_state = HSM_ST;
if (qc->tf.flags & ATA_TFLAG_POLLING)
queue_work(ata_wq, &ap->pio_task);
/* interrupt handler takes over from here */
}
/* if polling, ata_pio_task() handles the rest.
* otherwise, interrupt handler takes over from here.
*/
}
break;
@ -4005,15 +4005,15 @@ static void ata_dataout_task(void *_data)
ap->hsm_task_state = HSM_ST;
ata_pio_sector(qc);
ata_altstatus(ap); /* flush */
/* interrupt handler takes over from here */
} else {
} else
/* send CDB */
atapi_send_cdb(ap, qc);
if (qc->tf.flags & ATA_TFLAG_POLLING)
queue_work(ata_wq, &ap->pio_task);
}
/* if polling, ata_pio_task() handles the rest.
* otherwise, interrupt handler takes over from here.
*/
if (qc->tf.flags & ATA_TFLAG_POLLING)
queue_work(ata_wq, &ap->pio_task);
spin_unlock_irqrestore(&ap->host_set->lock, flags);