Re: [PATCH 0/7] Adis IRQ fixes and minor improvements

[Lars-Peter Clausen <lars@metafoo.de>]

On 4/13/21 1:20 PM, Nuno Sa wrote:
> The primary goal of this series was to fix the return value on some
> trigger handlers as spotted in [1]. While doing it, I found some minor
> improvements that I think are simple enough to include in this series.
>
> As for the first 2 patches, I opted to not do any functional change so
> I'm keeping the 'if (!adis->buffer)' check. However, 'adis-buffer' is
> allocated in 'update_scan_mode' hook which means we should be sure that
> the buffer is allocated and the check is really not needed. I did not
> went into the details but is there any way for the trigger handler to be
> called before the 'update_scan_mode' hook? If not, I'm happy in sending
> a v2 where we just remove the 'if'...

I do remember that the check was deliberate. I do remember of thinking 
about whether we need this and feeling uncomfortable about not having 
the check. But I think it is more a instance of defensive programming 
rather than actually being required.

It was less about the trigger being called before update_scan_mode, but 
in case it gets called if the allocation in update_scan_mode fails. But 
I think this should not be possible. So it is probably safe to remove it.

- Lars