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[SCSI] uas: disable use of blk-mq I/O path
The uas driver uses the block layer tag for USB3 stream IDs. With blk-mq we can get larger tag numbers that the queue depth, which breaks this assumption. A fix is under way for 3.18, but sits on top of large changes so can't easily be backported. Set the disable_blk_mq path so that a uas device can't easily crash the system when using blk-mq for SCSI. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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@ -970,6 +970,13 @@ static struct scsi_host_template uas_host_template = {
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.cmd_per_lun = 1, /* until we override it */
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.cmd_per_lun = 1, /* until we override it */
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.skip_settle_delay = 1,
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.skip_settle_delay = 1,
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.ordered_tag = 1,
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.ordered_tag = 1,
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/*
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* The uas drivers expects tags not to be bigger than the maximum
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* per-device queue depth, which is not true with the blk-mq tag
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* allocator.
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*/
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.disable_blk_mq = true,
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};
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};
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#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
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#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
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