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Date:	Wed, 20 Jul 2011 11:32:28 +0800
From:	Axel Lin <>
Cc:	Vinod Koul <>,
	Dan Williams <>
Subject: [PATCH] dmaengine: use DEFINE_IDR for static initialization

We could use DEFINE_IDR for statically allocated idr
that allow us to save a few lines of code.

And also remove unneeded mutex_init() for dma_list_mutex, as
dma_list_mutex is initialized automatically by DEFINE_MUTEX().

Signed-off-by: Axel Lin <>
 drivers/dma/dmaengine.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 26374b2..b48967b 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -62,9 +62,9 @@
 #include <linux/slab.h>
 static DEFINE_MUTEX(dma_list_mutex);
+static DEFINE_IDR(dma_idr);
 static LIST_HEAD(dma_device_list);
 static long dmaengine_ref_count;
-static struct idr dma_idr;
 /* --- sysfs implementation --- */
@@ -1050,8 +1050,6 @@ EXPORT_SYMBOL_GPL(dma_run_dependencies);
 static int __init dma_bus_init(void)
-	idr_init(&dma_idr);
-	mutex_init(&dma_list_mutex);
 	return class_register(&dma_devclass);

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