linux-kernel - [PATCH 5/5] dmaengine: fsldma: Use dma_pool

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Date:	Fri, 29 Apr 2016 22:09:12 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Li Yang <leoli@...escale.com>
Cc:	kernel-janitors@...r.kernel.org, Zhang Wei <zw@...kernel.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linuxppc-dev@...ts.ozlabs.org, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] dmaengine: fsldma: Use dma_pool_zalloc

Dma_pool_zalloc combines dma_pool_alloc and memset 0.  The semantic patch
that makes this transformation is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression d,e;
statement S;
@@

        d =
-            dma_pool_alloc
+            dma_pool_zalloc
             (...);
        if (!d) S
-       memset(d, 0, sizeof(*d));
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/dma/fsldma.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index aac85c3..a8828ed 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -462,13 +462,12 @@ static struct fsl_desc_sw *fsl_dma_alloc_descriptor(struct fsldma_chan *chan)
 	struct fsl_desc_sw *desc;
 	dma_addr_t pdesc;
 
-	desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
+	desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
 	if (!desc) {
 		chan_dbg(chan, "out of memory for link descriptor\n");
 		return NULL;
 	}
 
-	memset(desc, 0, sizeof(*desc));
 	INIT_LIST_HEAD(&desc->tx_list);
 	dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
 	desc->async_tx.tx_submit = fsl_dma_tx_submit;