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-rw-r--r--include/scsi/scsi_tcq.h14
1 files changed, 12 insertions, 2 deletions
diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index cf4c219c0b5c..17231385cb37 100644
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -140,8 +140,18 @@ static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag)
*/
static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
{
- shost->bqt = blk_init_tags(depth);
- return shost->bqt ? 0 : -ENOMEM;
+ /*
+ * If the shared tag map isn't already initialized, do it now.
+ * This saves callers from having to check ->bqt when setting up
+ * devices on the shared host (for libata)
+ */
+ if (!shost->bqt) {
+ shost->bqt = blk_init_tags(depth);
+ if (!shost->bqt)
+ return -ENOMEM;
+ }
+
+ return 0;
}
/**