Re: [PATCH 1/5] ASoC: sh: rz-ssi: Drop calling rz_ssi_pio_recv() recursively

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi!

> > On 2022-01-10 10:47 AM, Lad Prabhakar wrote:
> > > Instead of recursively calling rz_ssi_pio_recv() use a while loop
> > > to read the samples from RX fifo.
> >
> > Recursion and loops are means for doing something repeatedly. Could you
> > specify _why_ such change was made i.e. the conversion from one method
> > into the other? I bet the code is not being changed for the sake of
> > changing it, the reason is simply missing in the commit message.
> >
> I had feedback from Pavel "recursion is unwelcome in kernel due to
> limited stack use." which I did agree with as a result I have come up
> with this patch. Also to add this driver will later be used on Renesas
> RZ/A2 SoC's which runs with limited memory.
> 
> > Please note that refactoring below function into while-loop has a side
> > effect: everything had to be indented by additional tab. Generally,
> > readability increases if function is shaped 'linearly'.
> >
> I do agree, my initial patch just added a jump back to the start of
> the function if there are more samples, but Biju suggested to use a
> while loop instead.

Yes, loop is better.

I'd actually do while(true) and avoid using the done variable.

    if (!(!frames_left && fifo_samples >= runtime->channels))
              break;

will do the trick. Better yet, do

    if (frames_left || fifo_samples < runtime->channels)
              break;

because double negation is quite confusing and looks like typo.

Best regards,
								Pavel

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [Linux Samsung SOC]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux