[libata] REQUEST SENSE handling fixes
- 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.
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@ -3284,32 +3284,11 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct ata_host_set *host_set = ap->host_set;
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struct ata_device *dev = qc->dev;
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u8 host_stat = 0, drv_stat;
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unsigned long flags;
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DPRINTK("ENTER\n");
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/* FIXME: doesn't this conflict with timeout handling? */
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if (qc->dev->class == ATA_DEV_ATAPI && qc->scsicmd) {
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struct scsi_cmnd *cmd = qc->scsicmd;
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if (!(cmd->eh_eflags & SCSI_EH_CANCEL_CMD)) {
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/* finish completing original command */
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spin_lock_irqsave(&host_set->lock, flags);
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__ata_qc_complete(qc);
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spin_unlock_irqrestore(&host_set->lock, flags);
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atapi_request_sense(ap, dev, cmd);
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cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
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scsi_finish_command(cmd);
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goto out;
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}
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}
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spin_lock_irqsave(&host_set->lock, flags);
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/* hack alert! We cannot use the supplied completion
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@ -3348,7 +3327,6 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc)
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spin_unlock_irqrestore(&host_set->lock, flags);
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out:
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DPRINTK("EXIT\n");
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}
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@ -1955,22 +1955,44 @@ void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8
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done(cmd);
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}
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void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
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struct scsi_cmnd *cmd)
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static int atapi_sense_complete(struct ata_queued_cmd *qc,unsigned int err_mask)
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{
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DECLARE_COMPLETION(wait);
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struct ata_queued_cmd *qc;
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unsigned long flags;
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int rc;
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if (err_mask && ((err_mask & AC_ERR_DEV) == 0))
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/* FIXME: not quite right; we don't want the
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* translation of taskfile registers into
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* a sense descriptors, since that's only
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* correct for ATA, not ATAPI
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*/
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ata_gen_ata_desc_sense(qc);
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qc->scsidone(qc->scsicmd);
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return 0;
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}
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/* is it pointless to prefer PIO for "safety reasons"? */
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static inline int ata_pio_use_silly(struct ata_port *ap)
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{
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return (ap->flags & ATA_FLAG_PIO_DMA);
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}
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static void atapi_request_sense(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct scsi_cmnd *cmd = qc->scsicmd;
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DPRINTK("ATAPI request sense\n");
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qc = ata_qc_new_init(ap, dev);
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BUG_ON(qc == NULL);
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/* FIXME: is this needed? */
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memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
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ap->ops->tf_read(ap, &qc->tf);
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/* fill these in, for the case where they are -not- overwritten */
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cmd->sense_buffer[0] = 0x70;
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cmd->sense_buffer[2] = qc->tf.feature >> 4;
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ata_qc_reinit(qc);
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ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
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qc->dma_dir = DMA_FROM_DEVICE;
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@ -1981,22 +2003,20 @@ void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
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qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
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qc->tf.command = ATA_CMD_PACKET;
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qc->tf.protocol = ATA_PROT_ATAPI;
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qc->tf.lbam = (8 * 1024) & 0xff;
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qc->tf.lbah = (8 * 1024) >> 8;
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if (ata_pio_use_silly(ap)) {
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qc->tf.protocol = ATA_PROT_ATAPI_DMA;
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qc->tf.feature |= ATAPI_PKT_DMA;
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} else {
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qc->tf.protocol = ATA_PROT_ATAPI;
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qc->tf.lbam = (8 * 1024) & 0xff;
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qc->tf.lbah = (8 * 1024) >> 8;
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}
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qc->nbytes = SCSI_SENSE_BUFFERSIZE;
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qc->waiting = &wait;
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qc->complete_fn = ata_qc_complete_noop;
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qc->complete_fn = atapi_sense_complete;
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spin_lock_irqsave(&ap->host_set->lock, flags);
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rc = ata_qc_issue(qc);
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spin_unlock_irqrestore(&ap->host_set->lock, flags);
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if (rc)
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ata_port_disable(ap);
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else
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wait_for_completion(&wait);
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if (ata_qc_issue(qc))
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ata_qc_complete(qc, AC_ERR_OTHER);
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DPRINTK("EXIT\n");
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}
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@ -2008,19 +2028,8 @@ static int atapi_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask)
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VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
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if (unlikely(err_mask & AC_ERR_DEV)) {
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DPRINTK("request check condition\n");
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/* FIXME: command completion with check condition
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* but no sense causes the error handler to run,
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* which then issues REQUEST SENSE, fills in the sense
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* buffer, and completes the command (for the second
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* time). We need to issue REQUEST SENSE some other
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* way, to avoid completing the command twice.
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*/
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cmd->result = SAM_STAT_CHECK_CONDITION;
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qc->scsidone(cmd);
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atapi_request_sense(qc);
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return 1;
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}
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@ -54,8 +54,6 @@ extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
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/* libata-scsi.c */
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extern void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
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struct scsi_cmnd *cmd);
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extern void ata_scsi_scan_host(struct ata_port *ap);
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extern int ata_scsi_error(struct Scsi_Host *host);
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extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
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