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media: rtl2830: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT) 

Locking the root adapter for __i2c_transfer will deadlock if the
device sits behind a mux-locked I2C mux. Switch to the finer-grained
i2c_lock_bus with the I2C_LOCK_SEGMENT flag. If the device does not
sit behind a mux-locked mux, the two locking variants are equivalent.

Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Peter Rosin 2018-06-20 07:17:59 +02:00 committed by Wolfram Sang
parent c060a9fe07
commit dfecde4076
1 changed files with 6 additions and 6 deletions
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12
drivers/media/dvb-frontends/rtl2830.c
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@ -24,9 +24,9 @@ static int rtl2830_bulk_write(struct i2c_client *client, unsigned int reg,
struct rtl2830_dev *dev = i2c_get_clientdata(client);
int ret;
i2c_lock_adapter(client->adapter);
i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
ret = regmap_bulk_write(dev->regmap, reg, val, val_count);
i2c_unlock_adapter(client->adapter);
i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
return ret;
}
@ -36,9 +36,9 @@ static int rtl2830_update_bits(struct i2c_client *client, unsigned int reg,
struct rtl2830_dev *dev = i2c_get_clientdata(client);
int ret;
i2c_lock_adapter(client->adapter);
i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
ret = regmap_update_bits(dev->regmap, reg, mask, val);
i2c_unlock_adapter(client->adapter);
i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
return ret;
}
@ -48,9 +48,9 @@ static int rtl2830_bulk_read(struct i2c_client *client, unsigned int reg,
struct rtl2830_dev *dev = i2c_get_clientdata(client);
int ret;
i2c_lock_adapter(client->adapter);
i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
ret = regmap_bulk_read(dev->regmap, reg, val, val_count);
i2c_unlock_adapter(client->adapter);
i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
return ret;
}