On 2017-08-09 16:27, Mauro Carvalho Chehab wrote:
> Em Mon, 31 Jul 2017 15:38:52 +0200
> Peter Rosin <peda@xxxxxxxxxx> escreveu:
>
>> This prevents potentially scary debug messages from the i2c core.
>>
>> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
>> ---
>> drivers/media/usb/cx231xx/cx231xx-core.c | 3 +++
>> drivers/media/usb/cx231xx/cx231xx-i2c.c | 3 ++-
>> 2 files changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/usb/cx231xx/cx231xx-core.c b/drivers/media/usb/cx231xx/cx231xx-core.c
>> index 46646ecd2dbc..f372ad3917a8 100644
>> --- a/drivers/media/usb/cx231xx/cx231xx-core.c
>> +++ b/drivers/media/usb/cx231xx/cx231xx-core.c
>> @@ -1311,6 +1311,7 @@ int cx231xx_dev_init(struct cx231xx *dev)
>> dev->i2c_bus[0].i2c_period = I2C_SPEED_100K; /* 100 KHz */
>> dev->i2c_bus[0].i2c_nostop = 0;
>> dev->i2c_bus[0].i2c_reserve = 0;
>> + dev->i2c_bus[0].i2c_rc = -ENODEV;
>>
>> /* External Master 2 Bus */
>> dev->i2c_bus[1].nr = 1;
>> @@ -1318,6 +1319,7 @@ int cx231xx_dev_init(struct cx231xx *dev)
>> dev->i2c_bus[1].i2c_period = I2C_SPEED_100K; /* 100 KHz */
>> dev->i2c_bus[1].i2c_nostop = 0;
>> dev->i2c_bus[1].i2c_reserve = 0;
>> + dev->i2c_bus[1].i2c_rc = -ENODEV;
>>
>> /* Internal Master 3 Bus */
>> dev->i2c_bus[2].nr = 2;
>> @@ -1325,6 +1327,7 @@ int cx231xx_dev_init(struct cx231xx *dev)
>> dev->i2c_bus[2].i2c_period = I2C_SPEED_100K; /* 100kHz */
>> dev->i2c_bus[2].i2c_nostop = 0;
>> dev->i2c_bus[2].i2c_reserve = 0;
>> + dev->i2c_bus[2].i2c_rc = -ENODEV;
>>
>> /* register I2C buses */
>> errCode = cx231xx_i2c_register(&dev->i2c_bus[0]);
>> diff --git a/drivers/media/usb/cx231xx/cx231xx-i2c.c b/drivers/media/usb/cx231xx/cx231xx-i2c.c
>> index 3e49517cb5e0..8ce6b815d16d 100644
>> --- a/drivers/media/usb/cx231xx/cx231xx-i2c.c
>> +++ b/drivers/media/usb/cx231xx/cx231xx-i2c.c
>> @@ -553,7 +553,8 @@ int cx231xx_i2c_register(struct cx231xx_i2c *bus)
>> */
>> void cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
>> {
>> - i2c_del_adapter(&bus->i2c_adap);
>> + if (!bus->i2c_rc)
>> + i2c_del_adapter(&bus->i2c_adap);
>
> That doesn't sound right. what happens if i2c_rc is 1 or 2?
>
> IMHO, the right would would be, instead:
>
> if (bus->i2c_rc >= 0)
> i2c_del_adapter(&bus->i2c_adap);
In theory, yes. But in practice i2c_add_adapter never returns >0, and is
also documented so.
Let me know if you still want an update. In that case I'll also fix the
precedent present in the context of patch 1/3, i.e.
if (0 != bus->i2c_rc)
...
Cheers,
peda
