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[PATCH] libata-dev: fix the device err check sequence (respin)

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Current irq-pio checks ERR bit and stops on ERR before it does anything else.
This behavior doesn't look right.
The DRQ bit should take higher precedence than the ERR bit.

Changes:
- Let the HSM do the data transfer whenever the
  device asks for DRQ bit, even if the ERR bit is set.
- For DRQ=1 ERR=1, don't trust the data

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Albert Lee 2006-03-25 18:11:12 +08:00 committed by Jeff Garzik
parent 999bb6f426
commit 71601958f7
1 changed files with 38 additions and 6 deletions
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44
drivers/scsi/libata-core.c
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@ -3587,12 +3587,6 @@ static int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
*/
WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
/* check error */
if (unlikely(status & (ATA_ERR | ATA_DF))) {
qc->err_mask |= AC_ERR_DEV;
ap->hsm_task_state = HSM_ST_ERR;
}
fsm_start:
DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
ap->id, qc->tf.protocol, ap->hsm_task_state, status);
@ -3615,6 +3609,17 @@ fsm_start:
goto fsm_start;
}
/* Device should not ask for data transfer (DRQ=1)
* when it finds something wrong.
* Anyway, we respect DRQ here and let HSM go on
* without changing hsm_task_state to HSM_ST_ERR.
*/
if (unlikely(status & (ATA_ERR | ATA_DF))) {
printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
ap->id, status);
qc->err_mask |= AC_ERR_DEV;
}
/* Send the CDB (atapi) or the first data block (ata pio out).
* During the state transition, interrupt handler shouldn't
* be invoked before the data transfer is complete and
@ -3657,6 +3662,17 @@ fsm_start:
goto fsm_start;
}
/* Device should not ask for data transfer (DRQ=1)
* when it finds something wrong.
* Anyway, we respect DRQ here and let HSM go on
* without changing hsm_task_state to HSM_ST_ERR.
*/
if (unlikely(status & (ATA_ERR | ATA_DF))) {
printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
ap->id, status);
qc->err_mask |= AC_ERR_DEV;
}
atapi_pio_bytes(qc);
if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
@ -3672,6 +3688,22 @@ fsm_start:
goto fsm_start;
}
/* Some devices may ask for data transfer (DRQ=1)
* alone with ERR=1 for PIO reads.
* We respect DRQ here and let HSM go on without
* changing hsm_task_state to HSM_ST_ERR.
*/
if (unlikely(status & (ATA_ERR | ATA_DF))) {
/* For writes, ERR=1 DRQ=1 doesn't make
* sense since the data block has been
* transferred to the device.
*/
WARN_ON(qc->tf.flags & ATA_TFLAG_WRITE);
/* data might be corrputed */
qc->err_mask |= AC_ERR_DEV;
}
ata_pio_sectors(qc);
if (ap->hsm_task_state == HSM_ST_LAST &&