diff options
Diffstat (limited to 'drivers/media/dvb-frontends/rtl2832.c')
| -rw-r--r-- | drivers/media/dvb-frontends/rtl2832.c | 48 |
1 files changed, 38 insertions, 10 deletions
diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c index eaa74b0c8609..0f2a743bb195 100644 --- a/drivers/media/dvb-frontends/rtl2832.c +++ b/drivers/media/dvb-frontends/rtl2832.c @@ -1028,6 +1028,32 @@ static int rtl2832_regmap_gather_write(void *context, const void *reg, return 0; } +/* + * FIXME: Hack. Implement own regmap locking in order to silence lockdep + * recursive lock warning. That happens when regmap I2C client calls I2C mux + * adapter, which leads demod I2C repeater enable via demod regmap. Operation + * takes two regmap locks recursively - but those are different regmap instances + * in a two different I2C drivers, so it is not deadlock. Proper fix is to make + * regmap aware of lockdep. + */ +static void rtl2832_regmap_lock(void *__dev) +{ + struct rtl2832_dev *dev = __dev; + struct i2c_client *client = dev->client; + + dev_dbg(&client->dev, "\n"); + mutex_lock(&dev->regmap_mutex); +} + +static void rtl2832_regmap_unlock(void *__dev) +{ + struct rtl2832_dev *dev = __dev; + struct i2c_client *client = dev->client; + + dev_dbg(&client->dev, "\n"); + mutex_unlock(&dev->regmap_mutex); +} + static struct dvb_frontend *rtl2832_get_dvb_frontend(struct i2c_client *client) { struct rtl2832_dev *dev = i2c_get_clientdata(client); @@ -1186,15 +1212,6 @@ static int rtl2832_probe(struct i2c_client *client, .range_max = 5 * 0x100, }, }; - static const struct regmap_config regmap_config = { - .reg_bits = 8, - .val_bits = 8, - .volatile_reg = rtl2832_volatile_reg, - .max_register = 5 * 0x100, - .ranges = regmap_range_cfg, - .num_ranges = ARRAY_SIZE(regmap_range_cfg), - .cache_type = REGCACHE_RBTREE, - }; dev_dbg(&client->dev, "\n"); @@ -1213,8 +1230,19 @@ static int rtl2832_probe(struct i2c_client *client, INIT_DELAYED_WORK(&dev->i2c_gate_work, rtl2832_i2c_gate_work); INIT_DELAYED_WORK(&dev->stat_work, rtl2832_stat_work); /* create regmap */ + mutex_init(&dev->regmap_mutex); + dev->regmap_config.reg_bits = 8, + dev->regmap_config.val_bits = 8, + dev->regmap_config.lock = rtl2832_regmap_lock, + dev->regmap_config.unlock = rtl2832_regmap_unlock, + dev->regmap_config.lock_arg = dev, + dev->regmap_config.volatile_reg = rtl2832_volatile_reg, + dev->regmap_config.max_register = 5 * 0x100, + dev->regmap_config.ranges = regmap_range_cfg, + dev->regmap_config.num_ranges = ARRAY_SIZE(regmap_range_cfg), + dev->regmap_config.cache_type = REGCACHE_RBTREE, dev->regmap = regmap_init(&client->dev, ®map_bus, client, - ®map_config); + &dev->regmap_config); if (IS_ERR(dev->regmap)) { ret = PTR_ERR(dev->regmap); goto err_kfree; |