Re: sound/pci/ctxfi/ctdaio.c: duplicate function removal question

[Takashi Iwai <tiwai@xxxxxxx>]

On Sun, 29 Dec 2024 10:02:28 +0100,
David Laight wrote:
> 
> On Tue, 24 Dec 2024 23:16:17 +0000
> Ethan Carter Edwards <ethan@xxxxxxxxxxxxxxxxx> wrote:
> 
> > Hello all,
> > 
> > First of all, happy holidays. 
> > 
> > I was browsing the ctdaio.c code and I noticed a lot of 
> > duplicate code and functions, specifically:
> > 
> > dao_set_{right,left}_input and
> > dao_clear_{right,left}_input functions.
> > 
> > The functions are pretty much identical. They only 
> > differ in the side (left, right). What was the original
> > idea in doing this? Wouldn't it make more since to just
> > have an ENUM (left, right) as an argument that would 
> > determine the side and just reduce the function to 
> > dao_set_input and dao_clear_input.
> 
> Hmmm... you'd have a lot of conditionals inside the function.
> 
> They also look like a memory leak just waiting to happen.
> I guess that an earlier implementation used a separate kmalloc()
> for each imappers[].
> 
> Why is imappers[] an array of pointers not an array of the items?
> Each is just 8 bytes plus a 'list_head' (2 pointers?).

AFAIUC, it's a setup of a chained element, so no leak there as of
now.

I agree with that the code is unnecessarily complex, though.


thanks,

Takashi