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[SCSI] uas: disable use of blk-mq I/O path

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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>
This commit is contained in:
Christoph Hellwig 2014-10-03 01:47:09 -07:00 committed by James Bottomley
parent 078efae00f
commit 2c2d831c81
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/storage/uas.c
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@ -970,6 +970,13 @@ static struct scsi_host_template uas_host_template = {
.cmd_per_lun = 1, /* until we override it */
.skip_settle_delay = 1,
.ordered_tag = 1,
/*
* The uas drivers expects tags not to be bigger than the maximum
* per-device queue depth, which is not true with the blk-mq tag
* allocator.
*/
.disable_blk_mq = true,
};
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \