1 files changed, 48 insertions, 7 deletions

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 36c92f961e15..ee6be596503d 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -197,11 +197,43 @@ static void
 scsi_pool_free_command(struct scsi_host_cmd_pool *pool,
                          struct scsi_cmnd *cmd)
 {
+        if (cmd->prot_sdb)
+                kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb);
+
         kmem_cache_free(pool->sense_slab, cmd->sense_buffer);
         kmem_cache_free(pool->cmd_slab, cmd);
 }
 
 /**
+ * scsi_host_alloc_command - internal function to allocate command
+ * @shost:      SCSI host whose pool to allocate from
+ * @gfp_mask:   mask for the allocation
+ *
+ * Returns a fully allocated command with sense buffer and protection
+ * data buffer (where applicable) or NULL on failure
+ */
+static struct scsi_cmnd *
+scsi_host_alloc_command(struct Scsi_Host *shost, gfp_t gfp_mask)
+{
+        struct scsi_cmnd *cmd;
+
+        cmd = scsi_pool_alloc_command(shost->cmd_pool, gfp_mask);
+        if (!cmd)
+                return NULL;
+
+        if (scsi_host_get_prot(shost) >= SHOST_DIX_TYPE0_PROTECTION) {
+                cmd->prot_sdb = kmem_cache_zalloc(scsi_sdb_cache, gfp_mask);
+
+                if (!cmd->prot_sdb) {
+                        scsi_pool_free_command(shost->cmd_pool, cmd);
+                        return NULL;
+                }
+        }
+
+        return cmd;
+}
+
+/**
  * __scsi_get_command - Allocate a struct scsi_cmnd
  * @shost: host to transmit command
  * @gfp_mask: allocation mask
@@ -214,7 +246,7 @@ struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask)
         struct scsi_cmnd *cmd;
         unsigned char *buf;
 
-        cmd = scsi_pool_alloc_command(shost->cmd_pool, gfp_mask);
+        cmd = scsi_host_alloc_command(shost, gfp_mask);
 
         if (unlikely(!cmd)) {
                 unsigned long flags;
@@ -457,7 +489,7 @@ int scsi_setup_command_freelist(struct Scsi_Host *shost)
         /*
          * Get one backup command for this host.
          */
-        cmd = scsi_pool_alloc_command(shost->cmd_pool, gfp_mask);
+        cmd = scsi_host_alloc_command(shost, gfp_mask);
         if (!cmd) {
                 scsi_put_host_cmd_pool(gfp_mask);
                 shost->cmd_pool = NULL;
@@ -902,11 +934,20 @@ 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) {