From 8d316bf54b2a1965f9460d0ad9d80850d2c7afb3 Mon Sep 17 00:00:00 2001 From: Michael Krufky Date: Sun, 6 Jan 2008 15:31:35 -0300 Subject: [PATCH] V4L/DVB (6979): tda18271: use a mutex to protect state in critical sections Signed-off-by: Michael Krufky Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/frontends/tda18271-fe.c | 20 ++++++++++++++++++++ drivers/media/dvb/frontends/tda18271-priv.h | 3 +++ 2 files changed, 23 insertions(+) diff --git a/drivers/media/dvb/frontends/tda18271-fe.c b/drivers/media/dvb/frontends/tda18271-fe.c index c1da16ad07..e860f4c009 100644 --- a/drivers/media/dvb/frontends/tda18271-fe.c +++ b/drivers/media/dvb/frontends/tda18271-fe.c @@ -598,26 +598,36 @@ static int tda18271_init(struct dvb_frontend *fe) { struct tda18271_priv *priv = fe->tuner_priv; + mutex_lock(&priv->lock); + /* initialization */ tda18271_ir_cal_init(fe); if (priv->id == TDA18271HDC2) tda18271_rf_cal_init(fe); + mutex_unlock(&priv->lock); + return 0; } static int tda18271c2_tune(struct dvb_frontend *fe, u32 ifc, u32 freq, u32 bw, u8 std) { + struct tda18271_priv *priv = fe->tuner_priv; + tda_dbg("freq = %d, ifc = %d\n", freq, ifc); tda18271_init(fe); + mutex_lock(&priv->lock); + tda18271_rf_tracking_filters_correction(fe, freq); tda18271_channel_configuration(fe, ifc, freq, bw, std); + mutex_unlock(&priv->lock); + return 0; } @@ -632,6 +642,8 @@ static int tda18271c1_tune(struct dvb_frontend *fe, tda18271_init(fe); + mutex_lock(&priv->lock); + tda_dbg("freq = %d, ifc = %d\n", freq, ifc); /* RF tracking filter calibration */ @@ -766,6 +778,7 @@ static int tda18271c1_tune(struct dvb_frontend *fe, tda18271_write_regs(fe, R_TM, 15); msleep(5); + mutex_unlock(&priv->lock); return 0; } @@ -1012,7 +1025,9 @@ static int tda18271_get_id(struct dvb_frontend *fe) char *name; int ret = 0; + mutex_lock(&priv->lock); tda18271_read_regs(fe); + mutex_unlock(&priv->lock); switch (regs[R_ID] & 0x7f) { case 3: @@ -1065,6 +1080,7 @@ struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr, priv->i2c_adap = i2c; priv->gate = (cfg) ? cfg->gate : TDA18271_GATE_AUTO; priv->cal_initialized = false; + mutex_init(&priv->lock); fe->tuner_priv = priv; @@ -1084,8 +1100,12 @@ struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr, if (tda18271_debug & DBG_MAP) tda18271_dump_std_map(fe); + mutex_lock(&priv->lock); + tda18271_init_regs(fe); + mutex_unlock(&priv->lock); + return fe; fail: tda18271_release(fe); diff --git a/drivers/media/dvb/frontends/tda18271-priv.h b/drivers/media/dvb/frontends/tda18271-priv.h index b4d1ab770c..af89cfab00 100644 --- a/drivers/media/dvb/frontends/tda18271-priv.h +++ b/drivers/media/dvb/frontends/tda18271-priv.h @@ -23,6 +23,7 @@ #include #include +#include #include "tda18271.h" #define R_ID 0x00 /* ID byte */ @@ -112,6 +113,8 @@ struct tda18271_priv { struct tda18271_std_map std; struct tda18271_rf_tracking_filter_cal rf_cal_state[8]; + struct mutex lock; + u32 frequency; u32 bandwidth; }; -- 2.39.5