Re: [PATCH] leds: turris-omnia: Fix unused variable

["Marek Behún" <kabel@kernel.org>]

On Fri, 22 Sep 2023 07:59:19 +0100
Lee Jones <lee@kernel.org> wrote:

> On Thu, 21 Sep 2023, Marek Behún wrote:
> 
> > The variable ret is not used in this function.
> > 
> > Fixes: 28350bc0ac77 ("leds: turris-omnia: Do not use SMBUS calls")
> > Closes: https://lore.kernel.org/linux-leds/202309212215.Yl5VQaSm-lkp@intel.com/T/#u
> > Signed-off-by: Marek Behún <kabel@kernel.org>
> > ---
> >  drivers/leds/leds-turris-omnia.c | 1 -
> >  1 file changed, 1 deletion(-)  
> 
> I already fixed and squashed this.
> 
> How was this missed when you tested the set?

I am not sure, but it is possible that I've refactored that function
from my original (return 0 on success) to your proposed (return number
of written bytes on success) and did not notice the warning. I am sure
I tested that the result works. Maybe I switched to another terminal
where I was testing it too fast and did not notice the warning.

Sorry about this.

Anyway, I have a question. Several days ago I also sent for review
a new driver for other feautres the Turris Omnia MCU provides (GPIO,
watchdog, wakeup+poweroff).
There, I also refactored the _write and _read functions as you
suggested (to return the number of bytes written/read).
On review, Andy Shevchenko requested [1] to refactor it to my original
(return 0 on success). I mentioned to him [2] your request, to which he
replied [3]:
  This is strange. For example, regmap APIs never returns amount of
  data written or read. I think it's solely depends on the API. It might
  be useful for i²c APIs, in case you can do something about it. but if
  you have wrappers on top of that already (meaning not using directly
  the i2c_*() calls, I dunno the positive return is anyhow useful.
Since I agree with him, taking this into account, would you accept a
patch that returns those function to how I originally wrote them
(return 0 on success)?

Thanks.

Marek

[1]
https://lore.kernel.org/linux-gpio/ZQmUFPvIx91+ps6k@smile.fi.intel.com/
[2]
https://lore.kernel.org/linux-gpio/ZQnn+Gi0xVlsGCYA@smile.fi.intel.com/
[3]
https://lore.kernel.org/linux-gpio/ZQnn+Gi0xVlsGCYA@smile.fi.intel.com/