linux-kernel - [PATCH] media: vb2 dma-contig: Constify dma_buf

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Message-Id: <f1403ce121c467e3c6fb33ead41ff665985a431f.1498908191.git.arvind.yadav.cs@gmail.com>
Date:   Sat,  1 Jul 2017 16:57:13 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     pawel@...iak.com, m.szyprowski@...sung.com,
        kyungmin.park@...sung.com, mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: vb2 dma-contig: Constify dma_buf_ops structures.

dma_buf_ops are not supposed to change at runtime. All functions
working with dma_buf_ops provided by <linux/dma-buf.h> work with
const dma_buf_ops. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
   6035	    272	      0	   6307	   18a3 drivers/media/v4l2-core/videobuf2-dma-contig.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   6155	    160	      0	   6315	   18ab drivers/media/v4l2-core/videobuf2-dma-contig.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
 drivers/media/v4l2-core/videobuf2-dma-contig.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index 4f246d1..5b90a66 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -352,7 +352,7 @@ static int vb2_dc_dmabuf_ops_mmap(struct dma_buf *dbuf,
 	return vb2_dc_mmap(dbuf->priv, vma);
 }
 
-static struct dma_buf_ops vb2_dc_dmabuf_ops = {
+static const struct dma_buf_ops vb2_dc_dmabuf_ops = {
 	.attach = vb2_dc_dmabuf_ops_attach,
 	.detach = vb2_dc_dmabuf_ops_detach,
 	.map_dma_buf = vb2_dc_dmabuf_ops_map,
-- 
2.7.4