linux-kernel - Re: [RFC PATCH 01/10] mmc: core: improve API to make clear mmc_hw

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Date:   Wed, 6 Apr 2022 09:58:46 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 01/10] mmc: core: improve API to make clear
 mmc_hw_reset is for cards

Hi Ulf,

> > To make it unambiguous that mmc_hw_reset() is for cards and not for
> > controllers, we a) add 'card' to the function name and b) make the
> > function argument mmc_card instead of mmc_host. A fallback is provided
> > until all users are converted.
> 
> In my opinion, I think b) is sufficient and would be a nice improvement.

If you say so... but I do wonder why we can't be super clear with the
function name alone without the function argument as an additional
source of information? Kernel hacking is complicated enough.

> In this regard, I suggest we make one big cross-subsystem patch (the
> smallest change as possible) then I can pick it up and send it for the
> v5.18-rc2.

Ok, I can prepare this.

> > -static void mmc_hw_reset_for_init(struct mmc_host *host)
> > +/* we can't use mmc_card as a parameter, it is not populated yet */
> 
> Please drop this. The function is internal/static and at least to me,
> rather self-explanatory.

All other ?w_reset() functions have a card as a parameter. For people
trying to get into the MMC core, this comment might be helpful to
understand the anomaly? I know that you as the maintainer do know this
by heart, this comment is meant for people learning the stuff.

All the best,

   Wolfram

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