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media: tuners: tda8290: reduce stack usage with kasan 

With CONFIG_KASAN enabled, we get a relatively large stack frame in one function

drivers/media/tuners/tda8290.c: In function 'tda8290_set_params':
drivers/media/tuners/tda8290.c:310:1: warning: the frame size of 1520 bytes is larger than 1024 bytes [-Wframe-larger-than=]

With CONFIG_KASAN_EXTRA this goes up to

drivers/media/tuners/tda8290.c: In function 'tda8290_set_params':
drivers/media/tuners/tda8290.c:310:1: error: the frame size of 3200 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]

We can significantly reduce this by marking local arrays as 'static const', and
this should result in better compiled code for everyone.

[mchehab@s-opensource.com: fix a trivial merge conflict]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Michael Ira Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Arnd Bergmann 2017-12-11 07:06:04 -05:00 коммит произвёл Mauro Carvalho Chehab
Родитель c6b73bfcea
Коммит 8ff230fb4f
1 изменённых файлов: 40 добавлений и 38 удалений
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78
drivers/media/tuners/tda8290.c
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@ -63,8 +63,8 @@ static int tda8290_i2c_bridge(struct dvb_frontend *fe, int close)
{ {
struct tda8290_priv *priv = fe->analog_demod_priv; struct tda8290_priv *priv = fe->analog_demod_priv;
unsigned char enable[2] = { 0x21, 0xC0 }; static unsigned char enable[2] = { 0x21, 0xC0 };
unsigned char disable[2] = { 0x21, 0x00 }; static unsigned char disable[2] = { 0x21, 0x00 };
unsigned char *msg; unsigned char *msg;
if (close) { if (close) {
@ -84,9 +84,9 @@ static int tda8295_i2c_bridge(struct dvb_frontend *fe, int close)
{ {
struct tda8290_priv *priv = fe->analog_demod_priv; struct tda8290_priv *priv = fe->analog_demod_priv;
unsigned char enable[2] = { 0x45, 0xc1 }; static unsigned char enable[2] = { 0x45, 0xc1 };
unsigned char disable[2] = { 0x46, 0x00 }; static unsigned char disable[2] = { 0x46, 0x00 };
unsigned char buf[3] = { 0x45, 0x01, 0x00 }; static unsigned char buf[3] = { 0x45, 0x01, 0x00 };
unsigned char *msg; unsigned char *msg;
if (close) { if (close) {
@ -178,25 +178,25 @@ static void tda8290_set_params(struct dvb_frontend *fe,
{ {
struct tda8290_priv *priv = fe->analog_demod_priv; struct tda8290_priv *priv = fe->analog_demod_priv;
unsigned char soft_reset[] = { 0x00, 0x00 }; static unsigned char soft_reset[] = { 0x00, 0x00 };
unsigned char easy_mode[] = { 0x01, priv->tda8290_easy_mode }; unsigned char easy_mode[] = { 0x01, priv->tda8290_easy_mode };
unsigned char expert_mode[] = { 0x01, 0x80 }; static unsigned char expert_mode[] = { 0x01, 0x80 };
unsigned char agc_out_on[] = { 0x02, 0x00 }; static unsigned char agc_out_on[] = { 0x02, 0x00 };
unsigned char gainset_off[] = { 0x28, 0x14 }; static unsigned char gainset_off[] = { 0x28, 0x14 };
unsigned char if_agc_spd[] = { 0x0f, 0x88 }; static unsigned char if_agc_spd[] = { 0x0f, 0x88 };
unsigned char adc_head_6[] = { 0x05, 0x04 }; static unsigned char adc_head_6[] = { 0x05, 0x04 };
unsigned char adc_head_9[] = { 0x05, 0x02 }; static unsigned char adc_head_9[] = { 0x05, 0x02 };
unsigned char adc_head_12[] = { 0x05, 0x01 }; static unsigned char adc_head_12[] = { 0x05, 0x01 };
unsigned char pll_bw_nom[] = { 0x0d, 0x47 }; static unsigned char pll_bw_nom[] = { 0x0d, 0x47 };
unsigned char pll_bw_low[] = { 0x0d, 0x27 }; static unsigned char pll_bw_low[] = { 0x0d, 0x27 };
unsigned char gainset_2[] = { 0x28, 0x64 }; static unsigned char gainset_2[] = { 0x28, 0x64 };
unsigned char agc_rst_on[] = { 0x0e, 0x0b }; static unsigned char agc_rst_on[] = { 0x0e, 0x0b };
unsigned char agc_rst_off[] = { 0x0e, 0x09 }; static unsigned char agc_rst_off[] = { 0x0e, 0x09 };
unsigned char if_agc_set[] = { 0x0f, 0x81 }; static unsigned char if_agc_set[] = { 0x0f, 0x81 };
unsigned char addr_adc_sat = 0x1a; static unsigned char addr_adc_sat = 0x1a;
unsigned char addr_agc_stat = 0x1d; static unsigned char addr_agc_stat = 0x1d;
unsigned char addr_pll_stat = 0x1b; static unsigned char addr_pll_stat = 0x1b;
unsigned char adc_sat = 0, agc_stat = 0, static unsigned char adc_sat = 0, agc_stat = 0,
pll_stat; pll_stat;
int i; int i;
@ -468,9 +468,9 @@ static void tda8290_standby(struct dvb_frontend *fe)
{ {
struct tda8290_priv *priv = fe->analog_demod_priv; struct tda8290_priv *priv = fe->analog_demod_priv;
unsigned char cb1[] = { 0x30, 0xD0 }; static unsigned char cb1[] = { 0x30, 0xD0 };
unsigned char tda8290_standby[] = { 0x00, 0x02 }; static unsigned char tda8290_standby[] = { 0x00, 0x02 };
unsigned char tda8290_agc_tri[] = { 0x02, 0x20 }; static unsigned char tda8290_agc_tri[] = { 0x02, 0x20 };
struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0, .buf=cb1, .len = 2}; struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0, .buf=cb1, .len = 2};
if (fe->ops.analog_ops.i2c_gate_ctrl) if (fe->ops.analog_ops.i2c_gate_ctrl)
@ -495,9 +495,9 @@ static void tda8290_init_if(struct dvb_frontend *fe)
{ {
struct tda8290_priv *priv = fe->analog_demod_priv; struct tda8290_priv *priv = fe->analog_demod_priv;
unsigned char set_VS[] = { 0x30, 0x6F }; static unsigned char set_VS[] = { 0x30, 0x6F };
unsigned char set_GP00_CF[] = { 0x20, 0x01 }; static unsigned char set_GP00_CF[] = { 0x20, 0x01 };
unsigned char set_GP01_CF[] = { 0x20, 0x0B }; static unsigned char set_GP01_CF[] = { 0x20, 0x0B };
if ((priv->cfg.config == TDA8290_LNA_GP0_HIGH_ON) || if ((priv->cfg.config == TDA8290_LNA_GP0_HIGH_ON) ||
(priv->cfg.config == TDA8290_LNA_GP0_HIGH_OFF)) (priv->cfg.config == TDA8290_LNA_GP0_HIGH_OFF))
@ -539,10 +539,12 @@ static void tda8295_init_if(struct dvb_frontend *fe)
static void tda8290_init_tuner(struct dvb_frontend *fe) static void tda8290_init_tuner(struct dvb_frontend *fe)
{ {
struct tda8290_priv *priv = fe->analog_demod_priv; struct tda8290_priv *priv = fe->analog_demod_priv;
unsigned char tda8275_init[] = { 0x00, 0x00, 0x00, 0x40, 0xdC, 0x04, 0xAf, static unsigned char tda8275_init[] =
0x3F, 0x2A, 0x04, 0xFF, 0x00, 0x00, 0x40 }; { 0x00, 0x00, 0x00, 0x40, 0xdC, 0x04, 0xAf,
unsigned char tda8275a_init[] = { 0x00, 0x00, 0x00, 0x00, 0xdC, 0x05, 0x8b, 0x3F, 0x2A, 0x04, 0xFF, 0x00, 0x00, 0x40 };
0x0c, 0x04, 0x20, 0xFF, 0x00, 0x00, 0x4b }; static unsigned char tda8275a_init[] =
{ 0x00, 0x00, 0x00, 0x00, 0xdC, 0x05, 0x8b,
0x0c, 0x04, 0x20, 0xFF, 0x00, 0x00, 0x4b };
struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0, struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0,
.buf=tda8275_init, .len = 14}; .buf=tda8275_init, .len = 14};
if (priv->ver & TDA8275A) if (priv->ver & TDA8275A)
@ -834,11 +836,11 @@ int tda829x_probe(struct i2c_adapter *i2c_adap, u8 i2c_addr)
.addr = i2c_addr, .addr = i2c_addr,
}; };
unsigned char soft_reset[] = { 0x00, 0x00 }; static unsigned char soft_reset[] = { 0x00, 0x00 };
unsigned char easy_mode_b[] = { 0x01, 0x02 }; static unsigned char easy_mode_b[] = { 0x01, 0x02 };
unsigned char easy_mode_g[] = { 0x01, 0x04 }; static unsigned char easy_mode_g[] = { 0x01, 0x04 };
unsigned char restore_9886[] = { 0x00, 0xd6, 0x30 }; static unsigned char restore_9886[] = { 0x00, 0xd6, 0x30 };
unsigned char addr_dto_lsb = 0x07; static unsigned char addr_dto_lsb = 0x07;
unsigned char data; unsigned char data;
#define PROBE_BUFFER_SIZE 8 #define PROBE_BUFFER_SIZE 8
unsigned char buf[PROBE_BUFFER_SIZE]; unsigned char buf[PROBE_BUFFER_SIZE];