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[libata] REQUEST SENSE handling fixes

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- Move ATAPI check-condition handling out of the timeout handler
- Use multi-qc-issue feature to issue REQUEST SENSE ATAPI PACKET
  command upon receiving an ATAPI check-condition.

This cleans things up a lot, and eliminates a nasty recursion bug.
This commit is contained in:
Jeff Garzik
2005-11-14 14:50:05 -05:00
parent 2c13b7cee0
commit c6e6e666cb
3 changed files with 43 additions and 58 deletions
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77
drivers/scsi/libata-scsi.c
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@@ -1955,22 +1955,44 @@ void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8
done(cmd);
}
void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
struct scsi_cmnd *cmd)
static int atapi_sense_complete(struct ata_queued_cmd *qc,unsigned int err_mask)
{
DECLARE_COMPLETION(wait);
struct ata_queued_cmd *qc;
unsigned long flags;
int rc;
if (err_mask && ((err_mask & AC_ERR_DEV) == 0))
/* FIXME: not quite right; we don't want the
* translation of taskfile registers into
* a sense descriptors, since that's only
* correct for ATA, not ATAPI
*/
ata_gen_ata_desc_sense(qc);
qc->scsidone(qc->scsicmd);
return 0;
}
/* is it pointless to prefer PIO for "safety reasons"? */
static inline int ata_pio_use_silly(struct ata_port *ap)
{
return (ap->flags & ATA_FLAG_PIO_DMA);
}
static void atapi_request_sense(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct scsi_cmnd *cmd = qc->scsicmd;
DPRINTK("ATAPI request sense\n");
qc = ata_qc_new_init(ap, dev);
BUG_ON(qc == NULL);
/* FIXME: is this needed? */
memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
ap->ops->tf_read(ap, &qc->tf);
/* fill these in, for the case where they are -not- overwritten */
cmd->sense_buffer[0] = 0x70;
cmd->sense_buffer[2] = qc->tf.feature >> 4;
ata_qc_reinit(qc);
ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
qc->dma_dir = DMA_FROM_DEVICE;
@@ -1981,22 +2003,20 @@ void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
qc->tf.command = ATA_CMD_PACKET;
qc->tf.protocol = ATA_PROT_ATAPI;
qc->tf.lbam = (8 * 1024) & 0xff;
qc->tf.lbah = (8 * 1024) >> 8;
if (ata_pio_use_silly(ap)) {
qc->tf.protocol = ATA_PROT_ATAPI_DMA;
qc->tf.feature |= ATAPI_PKT_DMA;
} else {
qc->tf.protocol = ATA_PROT_ATAPI;
qc->tf.lbam = (8 * 1024) & 0xff;
qc->tf.lbah = (8 * 1024) >> 8;
}
qc->nbytes = SCSI_SENSE_BUFFERSIZE;
qc->waiting = &wait;
qc->complete_fn = ata_qc_complete_noop;
qc->complete_fn = atapi_sense_complete;
spin_lock_irqsave(&ap->host_set->lock, flags);
rc = ata_qc_issue(qc);
spin_unlock_irqrestore(&ap->host_set->lock, flags);
if (rc)
ata_port_disable(ap);
else
wait_for_completion(&wait);
if (ata_qc_issue(qc))
ata_qc_complete(qc, AC_ERR_OTHER);
DPRINTK("EXIT\n");
}
@@ -2008,19 +2028,8 @@ static int atapi_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask)
VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
if (unlikely(err_mask & AC_ERR_DEV)) {
DPRINTK("request check condition\n");
/* FIXME: command completion with check condition
* but no sense causes the error handler to run,
* which then issues REQUEST SENSE, fills in the sense
* buffer, and completes the command (for the second
* time). We need to issue REQUEST SENSE some other
* way, to avoid completing the command twice.
*/
cmd->result = SAM_STAT_CHECK_CONDITION;
qc->scsidone(cmd);
atapi_request_sense(qc);
return 1;
}