linux-kernel - [PATCH 02/13] async_tx: don't use src_list argument of async

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Date:	Wed, 18 Mar 2009 12:20:26 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	neilb@...e.de, maciej.sosnowski@...el.com,
	Yuri Tikhonov <yur@...raft.com>, Ilya Yanok <yanok@...raft.com>
Subject: [PATCH 02/13] async_tx: don't use src_list argument of async_xor()
	for dma addresses

From: Yuri Tikhonov <yur@...raft.com>

Using src_list argument of async_xor() as a storage for dma addresses
implies sizeof(dma_addr_t) <= sizeof(struct page *) restriction which is
not always true (e.g. ppc440spe).

Signed-off-by: Ilya Yanok <yanok@...raft.com>
Signed-off-by: Yuri Tikhonov <yur@...raft.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 crypto/async_tx/async_xor.c |   14 ++------------
 1 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index 595b786..e1f1f28 100644
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -42,7 +42,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list,
 	     dma_async_tx_callback cb_fn, void *cb_param)
 {
 	struct dma_device *dma = chan->device;
-	dma_addr_t *dma_src = (dma_addr_t *) src_list;
+	dma_addr_t dma_src[src_cnt];
 	struct dma_async_tx_descriptor *tx = NULL;
 	int src_off = 0;
 	int i;
@@ -254,7 +254,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
 	BUG_ON(src_cnt <= 1);
 
 	if (device && src_cnt <= device->max_xor) {
-		dma_addr_t *dma_src = (dma_addr_t *) src_list;
+		dma_addr_t dma_src[src_cnt];
 		unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
 		int i;
 
@@ -303,16 +303,6 @@ EXPORT_SYMBOL_GPL(async_xor_zero_sum);
 
 static int __init async_xor_init(void)
 {
-	#ifdef CONFIG_DMA_ENGINE
-	/* To conserve stack space the input src_list (array of page pointers)
-	 * is reused to hold the array of dma addresses passed to the driver.
-	 * This conversion is only possible when dma_addr_t is less than the
-	 * the size of a pointer.  HIGHMEM64G is known to violate this
-	 * assumption.
-	 */
-	BUILD_BUG_ON(sizeof(dma_addr_t) > sizeof(struct page *));
-	#endif
-
 	return 0;
 }
 

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