[PATCH] mediatek: constify vb2_ops structure

From	"Gustavo A. R. Silva" <garsilva@embeddedor.com>
Newsgroups	linux.kernel
Subject	[PATCH] mediatek: constify vb2_ops structure
Date	2017-07-06 23:00 +0200
Message-ID	<u0m2t-2hh-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Check for vb2_ops structures that are only stored in the ops field of a
vb2_queue structure. That field is declared const, so vb2_ops structures
that have this property can be declared as const also.

This issue was detected using Coccinelle and the following semantic patch:

@r disable optional_qualifier@
identifier i;
position p;
@@
static struct vb2_ops i@p = { ... };

@ok@
identifier r.i;
struct vb2_queue e;
position p;
@@
e.ops = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct vb2_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
struct vb2_ops i = { ... };

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
 drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
index 451a540..f17a86b 100644
--- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
+++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
@@ -756,7 +756,7 @@ static void mtk_jpeg_stop_streaming(struct vb2_queue *q)
 	pm_runtime_put_sync(ctx->jpeg->dev);
 }
 
-static struct vb2_ops mtk_jpeg_qops = {
+static const struct vb2_ops mtk_jpeg_qops = {
 	.queue_setup        = mtk_jpeg_queue_setup,
 	.buf_prepare        = mtk_jpeg_buf_prepare,
 	.buf_queue          = mtk_jpeg_buf_queue,
-- 
2.5.0

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[PATCH] mediatek: constify vb2_ops structure "Gustavo A. R. Silva" <garsilva@embeddedor.com> - 2017-07-06 23:00 +0200

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