From: Arnd Bergmann Date: Mon, 11 Dec 2017 12:06:04 +0000 (-0500) Subject: media: tuners: tda8290: reduce stack usage with kasan X-Git-Tag: v4.16-rc1~57^2~224 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=8ff230fb4f48816cd18a558a0d26f580178a26df;p=linux.git 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 Reviewed-by: Michael Ira Krufky Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/tuners/tda8290.c b/drivers/media/tuners/tda8290.c index f226e6ecc175..9f1f1d2b8bdc 100644 --- a/drivers/media/tuners/tda8290.c +++ b/drivers/media/tuners/tda8290.c @@ -63,8 +63,8 @@ static int tda8290_i2c_bridge(struct dvb_frontend *fe, int close) { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char enable[2] = { 0x21, 0xC0 }; - unsigned char disable[2] = { 0x21, 0x00 }; + static unsigned char enable[2] = { 0x21, 0xC0 }; + static unsigned char disable[2] = { 0x21, 0x00 }; unsigned char *msg; 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; - unsigned char enable[2] = { 0x45, 0xc1 }; - unsigned char disable[2] = { 0x46, 0x00 }; - unsigned char buf[3] = { 0x45, 0x01, 0x00 }; + static unsigned char enable[2] = { 0x45, 0xc1 }; + static unsigned char disable[2] = { 0x46, 0x00 }; + static unsigned char buf[3] = { 0x45, 0x01, 0x00 }; unsigned char *msg; if (close) { @@ -178,25 +178,25 @@ static void tda8290_set_params(struct dvb_frontend *fe, { 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 expert_mode[] = { 0x01, 0x80 }; - unsigned char agc_out_on[] = { 0x02, 0x00 }; - unsigned char gainset_off[] = { 0x28, 0x14 }; - unsigned char if_agc_spd[] = { 0x0f, 0x88 }; - unsigned char adc_head_6[] = { 0x05, 0x04 }; - unsigned char adc_head_9[] = { 0x05, 0x02 }; - unsigned char adc_head_12[] = { 0x05, 0x01 }; - unsigned char pll_bw_nom[] = { 0x0d, 0x47 }; - unsigned char pll_bw_low[] = { 0x0d, 0x27 }; - unsigned char gainset_2[] = { 0x28, 0x64 }; - unsigned char agc_rst_on[] = { 0x0e, 0x0b }; - unsigned char agc_rst_off[] = { 0x0e, 0x09 }; - unsigned char if_agc_set[] = { 0x0f, 0x81 }; - unsigned char addr_adc_sat = 0x1a; - unsigned char addr_agc_stat = 0x1d; - unsigned char addr_pll_stat = 0x1b; - unsigned char adc_sat = 0, agc_stat = 0, + static unsigned char expert_mode[] = { 0x01, 0x80 }; + static unsigned char agc_out_on[] = { 0x02, 0x00 }; + static unsigned char gainset_off[] = { 0x28, 0x14 }; + static unsigned char if_agc_spd[] = { 0x0f, 0x88 }; + static unsigned char adc_head_6[] = { 0x05, 0x04 }; + static unsigned char adc_head_9[] = { 0x05, 0x02 }; + static unsigned char adc_head_12[] = { 0x05, 0x01 }; + static unsigned char pll_bw_nom[] = { 0x0d, 0x47 }; + static unsigned char pll_bw_low[] = { 0x0d, 0x27 }; + static unsigned char gainset_2[] = { 0x28, 0x64 }; + static unsigned char agc_rst_on[] = { 0x0e, 0x0b }; + static unsigned char agc_rst_off[] = { 0x0e, 0x09 }; + static unsigned char if_agc_set[] = { 0x0f, 0x81 }; + static unsigned char addr_adc_sat = 0x1a; + static unsigned char addr_agc_stat = 0x1d; + static unsigned char addr_pll_stat = 0x1b; + static unsigned char adc_sat = 0, agc_stat = 0, pll_stat; int i; @@ -468,9 +468,9 @@ static void tda8290_standby(struct dvb_frontend *fe) { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char cb1[] = { 0x30, 0xD0 }; - unsigned char tda8290_standby[] = { 0x00, 0x02 }; - unsigned char tda8290_agc_tri[] = { 0x02, 0x20 }; + static unsigned char cb1[] = { 0x30, 0xD0 }; + static unsigned char tda8290_standby[] = { 0x00, 0x02 }; + static unsigned char tda8290_agc_tri[] = { 0x02, 0x20 }; struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0, .buf=cb1, .len = 2}; 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; - unsigned char set_VS[] = { 0x30, 0x6F }; - unsigned char set_GP00_CF[] = { 0x20, 0x01 }; - unsigned char set_GP01_CF[] = { 0x20, 0x0B }; + static unsigned char set_VS[] = { 0x30, 0x6F }; + static unsigned char set_GP00_CF[] = { 0x20, 0x01 }; + static unsigned char set_GP01_CF[] = { 0x20, 0x0B }; if ((priv->cfg.config == TDA8290_LNA_GP0_HIGH_ON) || (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) { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char tda8275_init[] = { 0x00, 0x00, 0x00, 0x40, 0xdC, 0x04, 0xAf, - 0x3F, 0x2A, 0x04, 0xFF, 0x00, 0x00, 0x40 }; - unsigned char tda8275a_init[] = { 0x00, 0x00, 0x00, 0x00, 0xdC, 0x05, 0x8b, - 0x0c, 0x04, 0x20, 0xFF, 0x00, 0x00, 0x4b }; + static unsigned char tda8275_init[] = + { 0x00, 0x00, 0x00, 0x40, 0xdC, 0x04, 0xAf, + 0x3F, 0x2A, 0x04, 0xFF, 0x00, 0x00, 0x40 }; + 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, .buf=tda8275_init, .len = 14}; if (priv->ver & TDA8275A) @@ -834,11 +836,11 @@ int tda829x_probe(struct i2c_adapter *i2c_adap, u8 i2c_addr) .addr = i2c_addr, }; - unsigned char soft_reset[] = { 0x00, 0x00 }; - unsigned char easy_mode_b[] = { 0x01, 0x02 }; - unsigned char easy_mode_g[] = { 0x01, 0x04 }; - unsigned char restore_9886[] = { 0x00, 0xd6, 0x30 }; - unsigned char addr_dto_lsb = 0x07; + static unsigned char soft_reset[] = { 0x00, 0x00 }; + static unsigned char easy_mode_b[] = { 0x01, 0x02 }; + static unsigned char easy_mode_g[] = { 0x01, 0x04 }; + static unsigned char restore_9886[] = { 0x00, 0xd6, 0x30 }; + static unsigned char addr_dto_lsb = 0x07; unsigned char data; #define PROBE_BUFFER_SIZE 8 unsigned char buf[PROBE_BUFFER_SIZE];