block: don't assume last put of shared tags is for the host

commit d45b3279a5a2252cafcd665bbf2db8c9b31ef783 upstream.

There is no inherent reason why the last put of a tag structure must be
the one for the Scsi_Host, as device model objects can be held for
arbitrary periods.  Merge blk_free_tags and __blk_free_tags into a single
funtion that just release a references and get rid of the BUG() when the
host reference wasn't the last.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/block/blk-tag.c b/block/blk-tag.c
index cc345e1d8d4ea0088832833ef985d6b1e764fa44..0c51b4b34f478b0d47460f954542c8ab643ba9eb 100644 (file)
--- a/block/blk-tag.c
+++ b/block/blk-tag.c
@@ -27,18 +27,15 @@ struct request *blk_queue_find_tag(struct request_queue *q, int tag)
 EXPORT_SYMBOL(blk_queue_find_tag);
 
 /**
- * __blk_free_tags - release a given set of tag maintenance info
+ * blk_free_tags - release a given set of tag maintenance info
  * @bqt:       the tag map to free
  *
- * Tries to free the specified @bqt.  Returns true if it was
- * actually freed and false if there are still references using it
+ * Drop the reference count on @bqt and frees it when the last reference
+ * is dropped.
  */
-static int __blk_free_tags(struct blk_queue_tag *bqt)
+void blk_free_tags(struct blk_queue_tag *bqt)
 {
-       int retval;
-
-       retval = atomic_dec_and_test(&bqt->refcnt);
-       if (retval) {
+       if (atomic_dec_and_test(&bqt->refcnt)) {
                BUG_ON(find_first_bit(bqt->tag_map, bqt->max_depth) <
                                                        bqt->max_depth);
 
@@ -50,9 +47,8 @@ static int __blk_free_tags(struct blk_queue_tag *bqt)
 
                kfree(bqt);
        }
-
-       return retval;
 }
+EXPORT_SYMBOL(blk_free_tags);
 
 /**
  * __blk_queue_free_tags - release tag maintenance info
@@ -69,27 +65,12 @@ void __blk_queue_free_tags(struct request_queue *q)
        if (!bqt)
                return;
 
-       __blk_free_tags(bqt);
+       blk_free_tags(bqt);
 
        q->queue_tags = NULL;
        queue_flag_clear_unlocked(QUEUE_FLAG_QUEUED, q);
 }
 
-/**
- * blk_free_tags - release a given set of tag maintenance info
- * @bqt:       the tag map to free
- *
- * For externally managed @bqt frees the map.  Callers of this
- * function must guarantee to have released all the queues that
- * might have been using this tag map.
- */
-void blk_free_tags(struct blk_queue_tag *bqt)
-{
-       if (unlikely(!__blk_free_tags(bqt)))
-               BUG();
-}
-EXPORT_SYMBOL(blk_free_tags);
-
 /**
  * blk_queue_free_tags - release tag maintenance info
  * @q:  the request queue for the device