Re: [lm-sensors] [PATCH v3] hwmon: lm75: Add __devinit and

[Michael Lawnick <ml.lawnick@gmx.de>]

Datta, Shubhrajyoti said the following:
> 
> 
>> -----Original Message-----
>> From: Michael Lawnick [mailto:ml.lawnick@gmx.de]
>> Sent: Monday, September 13, 2010 4:42 PM
>> To: Datta, Shubhrajyoti
>> Cc: lm-sensors@lm-sensors.org
>> Subject: Re: [lm-sensors] [PATCH v3] hwmon: lm75: Add __devinit and
>> __devexit section initializers
>> 
>> Datta, Shubhrajyoti said the following:
>> >
>> >
>> >> -----Original Message-----
>> >> From: Michael Lawnick [mailto:ml.lawnick@gmx.de]
>> >> Sent: Monday, September 13, 2010 2:52 PM
>> >> To: Datta, Shubhrajyoti
>> >> Cc: lm-sensors@lm-sensors.org
>> >> Subject: Re: [lm-sensors] [PATCH v3] hwmon: lm75: Add __devinit and
>> >> __devexit section initializers
>> >>
>> >> Shubhrajyoti D said the following:
>> >> ...
>> >>
>> >> > -static int
>> >> > +static int __devinit
>> >> >  lm75_probe(struct i2c_client *client, const struct i2c_device_id
>> *id)
>> >> Are you sure?
>> >> If I understand correctly, this function will be thrown away after
>> >> system/module init. But what's about devices that are added later?
>> >> I would expect them to crash on init...
>> > As all of these are I2C devices are I2C I thought it makes sense.
>> > Are you aware of devices that can be plugged/wired runtime?
>> 
>> Almost all if behind a multiplexer ;-)
> I missed this part.
There even exist multiplexer that check the bus state and allow
connection only within stop<->start phases.
> 
>> There is just some care in synchronization needed.
>> We are currently working with such a system that dynamically adds buses
>> and drops them again (triggered by hotplug).
> Does it mean that all the existing drivers need to adapt.

I expect them to get adapted step by step when/if this really becomes an
issue. Maybe someday a general cleanup will necessary (and done). Anyway
this might be already an issue for hot plugged cards (e.g. a compact PCI
TV card) that has a local i2c adapter on and common devices on its local
bus. But either this scenario does not exist in practical life or was
fixed by a local code fix.

--
KR
Michael

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