block: add a blk_plug_device_unlocked() that grabs the queue lock

[linux-2.6-omap-h63xx.git] / block / blk-core.c

diff --git a/block/blk-core.c b/block/blk-core.c
index fef79ccb2a118da2f6f3144c993c8338c7205351..4889eb86a39e883c040d53627c98e61a96cd0e26 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -212,6 +212,24 @@ void blk_plug_device(struct request_queue *q)
 }
 EXPORT_SYMBOL(blk_plug_device);
 
+/**
+ * blk_plug_device_unlocked - plug a device without queue lock held
+ * @q:    The &struct request_queue to plug
+ *
+ * Description:
+ *   Like @blk_plug_device(), but grabs the queue lock and disables
+ *   interrupts.
+ **/
+void blk_plug_device_unlocked(struct request_queue *q)
+{
+       unsigned long flags;
+
+       spin_lock_irqsave(q->queue_lock, flags);
+       blk_plug_device(q);
+       spin_unlock_irqrestore(q->queue_lock, flags);
+}
+EXPORT_SYMBOL(blk_plug_device_unlocked);
+
 /*
  * remove the queue from the plugged list, if present. called with
  * queue lock held and interrupts disabled.