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-rw-r--r--block/blk-core.c16
-rw-r--r--block/blk-settings.c7
2 files changed, 15 insertions, 8 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 3cc17e6..bc2b7c5 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -446,6 +446,11 @@ void blk_put_queue(struct request_queue *q)
kobject_put(&q->kobj);
}
+/*
+ * Note: If a driver supplied the queue lock, it should not zap that lock
+ * unexpectedly as some queue cleanup components like elevator_exit() and
+ * blk_throtl_exit() need queue lock.
+ */
void blk_cleanup_queue(struct request_queue *q)
{
/*
@@ -540,6 +545,12 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
mutex_init(&q->sysfs_lock);
spin_lock_init(&q->__queue_lock);
+ /*
+ * By default initialize queue_lock to internal lock and driver can
+ * override it later if need be.
+ */
+ q->queue_lock = &q->__queue_lock;
+
return q;
}
EXPORT_SYMBOL(blk_alloc_queue_node);
@@ -624,7 +635,10 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn,
q->unprep_rq_fn = NULL;
q->unplug_fn = generic_unplug_device;
q->queue_flags = QUEUE_FLAG_DEFAULT;
- q->queue_lock = lock;
+
+ /* Override internal queue lock with supplied lock pointer */
+ if (lock)
+ q->queue_lock = lock;
/*
* This also sets hw/phys segments, boundary and size
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 36c8c1f..df649fa 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -176,13 +176,6 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn)
blk_queue_max_hw_sectors(q, BLK_SAFE_MAX_SECTORS);
/*
- * If the caller didn't supply a lock, fall back to our embedded
- * per-queue locks
- */
- if (!q->queue_lock)
- q->queue_lock = &q->__queue_lock;
-
- /*
* by default assume old behaviour and bounce for any highmem page
*/
blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);