linux-kernel - [PATCH] drm: bridge: dw-hdmi: constify snd_pcm

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Date:   Fri, 7 Jul 2017 18:58:44 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] drm: bridge: dw-hdmi: constify snd_pcm_ops structure

Check for snd_pcm_ops structures that are only stored in the ops field of
a snd_soc_platform_driver structure or passed as the third argument to
snd_pcm_set_ops. The corresponding field or parameter is declared const,
so snd_pcm_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 snd_pcm_ops i@p = { ... };

@ok1@
identifier r.i;
struct snd_soc_platform_driver e;
position p;
@@
e.ops = &i@p;

@ok2@
identifier r.i;
expression e1, e2; position p;
@@
snd_pcm_set_ops(e1, e2, &i@p)

@bad@
position p != {r.p,ok1.p,ok2.p};
identifier r.i;
struct snd_pcm_ops e;
@@
e@i@p

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

Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
index 8f2d137..cf3f0ca 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
@@ -517,7 +517,7 @@ static snd_pcm_uframes_t dw_hdmi_pointer(struct snd_pcm_substream *substream)
 	return bytes_to_frames(runtime, dw->buf_offset);
 }
 
-static struct snd_pcm_ops snd_dw_hdmi_ops = {
+static const struct snd_pcm_ops snd_dw_hdmi_ops = {
 	.open = dw_hdmi_open,
 	.close = dw_hdmi_close,
 	.ioctl = snd_pcm_lib_ioctl,
-- 
2.5.0