libata: fix ata_scsi_change_queue_depth()
Fix ata_scsi_change_queue_depth() such that... * NCQ on/off is exactly determined using the same logic as the issue path. * queue depth is adjusted to 1 if NCQ is not enabled. * -EINVAL is returned if requested action is ignored due to limitations. This fixes the bug which allows queue depth to be increased on blacklisted NCQ hosts/devices. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -987,29 +987,32 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
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struct ata_port *ap = ata_shost_to_port(sdev->host);
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struct ata_device *dev;
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unsigned long flags;
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int max_depth;
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if (queue_depth < 1)
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if (queue_depth < 1 || queue_depth == sdev->queue_depth)
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return sdev->queue_depth;
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dev = ata_scsi_find_dev(ap, sdev);
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if (!dev || !ata_dev_enabled(dev))
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return sdev->queue_depth;
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max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
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max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
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if (queue_depth > max_depth)
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queue_depth = max_depth;
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scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
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/* NCQ enabled? */
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spin_lock_irqsave(ap->lock, flags);
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if (queue_depth > 1)
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dev->flags &= ~ATA_DFLAG_NCQ_OFF;
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else
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dev->flags &= ~ATA_DFLAG_NCQ_OFF;
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if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
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dev->flags |= ATA_DFLAG_NCQ_OFF;
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queue_depth = 1;
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}
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spin_unlock_irqrestore(ap->lock, flags);
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/* limit and apply queue depth */
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queue_depth = min(queue_depth, sdev->host->can_queue);
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queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
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queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
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if (sdev->queue_depth == queue_depth)
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return -EINVAL;
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scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
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return queue_depth;
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}
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