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Subject[PATCH 4.4 18/32] USB: uas: Fix slave queue_depth not being set
4.4-stable review patch.  If anyone has any objections, please let me know.


From: Hans de Goede <>

commit 593224ea77b1ca842f45cf76f4deeef44dfbacd1 upstream.

Commit 198de51dbc34 ("USB: uas: Limit qdepth at the scsi-host level")
removed the scsi_change_queue_depth() call from uas_slave_configure()
assuming that the slave would inherit the host's queue_depth, which
that commit sets to the same value.

This is incorrect, without the scsi_change_queue_depth() call the slave's
queue_depth defaults to 1, introducing a performance regression.

This commit restores the call, fixing the performance regression.

Fixes: 198de51dbc34 ("USB: uas: Limit qdepth at the scsi-host level")
Reported-by: Tom Yan <>
Signed-off-by: Hans de Goede <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/usb/storage/uas.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -811,6 +811,7 @@ static int uas_slave_configure(struct sc
if (devinfo->flags & US_FL_BROKEN_FUA)
sdev->broken_fua = 1;

+ scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
return 0;

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