1 files changed, 14 insertions, 5 deletions

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 36c92f961e15..5276e73c58fc 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -902,11 +902,20 @@ void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags)
 
         spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
 
-        /* Check to see if the queue is managed by the block layer.
-         * If it is, and we fail to adjust the depth, exit. */
-        if (blk_queue_tagged(sdev->request_queue) &&
-            blk_queue_resize_tags(sdev->request_queue, tags) != 0)
-                goto out;
+        /*
+         * Check to see if the queue is managed by the block layer.
+         * If it is, and we fail to adjust the depth, exit.
+         *
+         * Do not resize the tag map if it is a host wide share bqt,
+         * because the size should be the hosts's can_queue. If there
+         * is more IO than the LLD's can_queue (so there are not enuogh
+         * tags) request_fn's host queue ready check will handle it.
+         */
+        if (!sdev->host->bqt) {
+                if (blk_queue_tagged(sdev->request_queue) &&
+                    blk_queue_resize_tags(sdev->request_queue, tags) != 0)
+                        goto out;
+        }
 
         sdev->queue_depth = tags;
         switch (tagged) {