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media: tuners: Constify struct tunertype, tuner_range and tuner_params

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'struct tunertype', 'struct tuner_range' and 'struct tuner_params' are not
modified in this driver.

Constifying these structures moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig:
Before:
======
   2877	   8554	      0	  11431	   2ca7	drivers/media/tuners/tuner-types.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  11421	     48	      0	  11469	   2ccd	drivers/media/tuners/tuner-types.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
This commit is contained in:
Christophe JAILLET 2024-08-27 21:57:58 +02:00 committed by Hans Verkuil
parent d22d91fb1d
commit 70d4fd1200
3 changed files with 161 additions and 161 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/media/tuners/tuner-simple.c
View File

@ -112,7 +112,7 @@ struct tuner_simple_priv {
struct list_head hybrid_tuner_instance_list;
unsigned int type;
struct tunertype *tun;
const struct tunertype *tun;
u32 frequency;
u32 bandwidth;
@ -232,11 +232,11 @@ static inline char *tuner_param_name(enum param_type type)
return name;
}
static struct tuner_params *simple_tuner_params(struct dvb_frontend *fe,
enum param_type desired_type)
static const struct tuner_params *simple_tuner_params(struct dvb_frontend *fe,
enum param_type desired_type)
{
struct tuner_simple_priv *priv = fe->tuner_priv;
struct tunertype *tun = priv->tun;
const struct tunertype *tun = priv->tun;
int i;
for (i = 0; i < tun->count; i++)
@ -257,7 +257,7 @@ static struct tuner_params *simple_tuner_params(struct dvb_frontend *fe,
}
static int simple_config_lookup(struct dvb_frontend *fe,
struct tuner_params *t_params,
const struct tuner_params *t_params,
unsigned *frequency, u8 *config, u8 *cb)
{
struct tuner_simple_priv *priv = fe->tuner_priv;
@ -549,7 +549,7 @@ static int simple_set_tv_freq(struct dvb_frontend *fe,
u8 buffer[4];
int rc, IFPCoff, i;
enum param_type desired_type;
struct tuner_params *t_params;
const struct tuner_params *t_params;
/* IFPCoff = Video Intermediate Frequency - Vif:
940 =16*58.75 NTSC/J (Japan)
@ -664,12 +664,12 @@ static int simple_set_tv_freq(struct dvb_frontend *fe,
static int simple_set_radio_freq(struct dvb_frontend *fe,
struct analog_parameters *params)
{
struct tunertype *tun;
const struct tunertype *tun;
struct tuner_simple_priv *priv = fe->tuner_priv;
u8 buffer[4];
u16 div;
int rc, j;
struct tuner_params *t_params;
const struct tuner_params *t_params;
unsigned int freq = params->frequency;
bool mono = params->audmode == V4L2_TUNER_MODE_MONO;
@ -848,8 +848,8 @@ static u32 simple_dvb_configure(struct dvb_frontend *fe, u8 *buf,
{
/* This function returns the tuned frequency on success, 0 on error */
struct tuner_simple_priv *priv = fe->tuner_priv;
struct tunertype *tun = priv->tun;
struct tuner_params *t_params;
const struct tunertype *tun = priv->tun;
const struct tuner_params *t_params;
u8 config, cb;
u32 div;
int ret;

296
drivers/media/tuners/tuner-types.c
View File

File diff suppressed because it is too large Load Diff

6
include/media/tuner-types.h
View File

@ -168,7 +168,7 @@ struct tuner_params {
u16 iffreq;
unsigned int count;
struct tuner_range *ranges;
const struct tuner_range *ranges;
};
/**
@ -189,7 +189,7 @@ struct tuner_params {
struct tunertype {
char *name;
unsigned int count;
struct tuner_params *params;
const struct tuner_params *params;
u16 min;
u16 max;
@ -199,7 +199,7 @@ struct tunertype {
u8 *sleepdata;
};
extern struct tunertype tuners[];
extern const struct tunertype tuners[];
extern unsigned const int tuner_count;
#endif