Re: [PATCH v6 01/24] i2c-mux: add common data for every i2c-mux instance

[Wolfram Sang <wsa@the-dreams.de>]

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> > I'd suggest to rename 'adapters' into 'num_adapters' throughout this
> > patch. I think it makes the code a lot easier to understand.
> 
> Hmm, you mean just the variable names, right? And not function names
> such as i2c_mux_reserve_(num_)adapters?

Yes, only variable names.

> > Despite that I wonder why not using some of the realloc functions, I
> 
> When I wrote it, I found no devm_ version of realloc. I'm not finding
> anything now either...

Right, there is no devm_ version of it :(

> > wonder even more if we couldn't supply num_adapters to i2c_mux_alloc()
> > and reserve the memory statically. i2c busses are not
> > dynamic/hot-pluggable so that should be good enough?
> 
> Yes, that would work, but it would take some restructuring in some of
> the drivers that currently don't know how many child adapters they
> are going to need when they call i2c_mux_alloc.

Which ones?

> Because you thought about removing i2c_mux_reserve_adapters completely,
> and not provide any means of adding more adapters than specified in
> the i2c_mux_alloc call, right?

Yes. I assumed I2C to be static enough that such information is known in
advance.

> > Ignoring the 80 char limit here makes the code more readable.
> 
> That is only true if you actually have more than 80 characters, so I don't
> agree. Are you adamant about it? (I'm not)

No. Keep it if you prefer it.

> >> +EXPORT_SYMBOL_GPL(i2c_mux_one_adapter);
> > 
> > Are you sure the above function pays off? Its argument list is very
> > complex and it doesn't save a lot of code. Having seperate calls is
> > probably more understandable in drivers? Then again, I assume it makes
> > the conversion of existing drivers easier.
> 
> I added it in v4, you can check earlier versions if you like. Without
> it most gate-muxes (i.e. typically the muxes in drivers/media) grew
> since the i2c_add_mux_adapter call got replaced by two calls, i.e.
> i2c_mux_alloc followed by i2c_max_add_adapter, and coupled with
> error checks made it look more complex than before. So, this wasn't
> much of a cleanup from the point of those drivers.

Hmm, v3 didn't have the driver patches posted with it. Can you push it
to your branch? I am also not too strong with this one, but having a
look how it looks without would be nice.


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