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authorJens Axboe <jens.axboe@oracle.com>2008-08-01 20:31:32 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-08-01 20:31:32 +0200
commit6c5e0c4d518a37e1d5d794c14433e80284415079 (patch)
tree26208a4fe4115a37c000a13d50df8c1a5e393553 /block
parent94ad374a0751f40d25e22e036c37f7263569d24c (diff)
block: add a blk_plug_device_unlocked() that grabs the queue lock
blk_plug_device() must be called with the queue lock held, so callers often just grab and release the lock for that purpose. Add a helper that does just that. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index fef79ccb2a11..4889eb86a39e 100644
--- 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.

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