linux-kernel - [PATCH] auxdisplay: ht16k33: constify fb_fix_screeninfo and fb_var

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Message-ID: <20170708005624.GA17338@embeddedgus>
Date:   Fri, 7 Jul 2017 19:56:24 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Robin van der Gracht <robin@...tonic.nl>,
        Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] auxdisplay: ht16k33: constify fb_fix_screeninfo and
 fb_var_screeninfo structures

These structures are only used to copy into other structures,
so declare them as const.

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

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

@ok@
identifier r.i;
expression e;
position p;
@@
e = i@p

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

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

The semantic patch for fb_var_screeninfo is analogous.

Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/auxdisplay/ht16k33.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index fbfa5b4..a0162b5 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -82,7 +82,7 @@ struct ht16k33_priv {
 	struct ht16k33_fbdev fbdev;
 };
 
-static struct fb_fix_screeninfo ht16k33_fb_fix = {
+static const struct fb_fix_screeninfo ht16k33_fb_fix = {
 	.id		= DRIVER_NAME,
 	.type		= FB_TYPE_PACKED_PIXELS,
 	.visual		= FB_VISUAL_MONO10,
@@ -93,7 +93,7 @@ static struct fb_fix_screeninfo ht16k33_fb_fix = {
 	.accel		= FB_ACCEL_NONE,
 };
 
-static struct fb_var_screeninfo ht16k33_fb_var = {
+static const struct fb_var_screeninfo ht16k33_fb_var = {
 	.xres = HT16K33_MATRIX_LED_MAX_ROWS,
 	.yres = HT16K33_MATRIX_LED_MAX_COLS,
 	.xres_virtual = HT16K33_MATRIX_LED_MAX_ROWS,
-- 
2.5.0