linux-kernel - Re: [PATCH v3] ata/pata_buddha: Probe via modalias instead of initcall

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Date:   Mon, 29 Jul 2019 11:05:27 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Max Staudt <max@...as.org>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jens Axboe <axboe@...nel.dk>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Michael Schmitz <schmitzmic@...il.com>,
        linux-ide@...r.kernel.org,
        "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ata/pata_buddha: Probe via modalias instead of initcall

Hi Max,

On Thu, Jul 25, 2019 at 8:08 PM Max Staudt <max@...as.org> wrote:
> Up until now, the pata_buddha driver would only check for cards on
> initcall time. Now, the kernel will call its probe function as soon
> as a compatible card is detected.
>
> v3: Clean up devm_*, implement device removal.
>
> v2: Rename 'zdev' to 'z' to make the patch easy to analyse with
>     git diff --ignore-space-change
>
> Tested-by: Max Staudt <max@...as.org>
> Signed-off-by: Max Staudt <max@...as.org>

Sorry, I only noticed v3 after I replied to v2.
My comments are still valid, though.

> --- a/drivers/ata/pata_buddha.c
> +++ b/drivers/ata/pata_buddha.c

> +static const struct zorro_device_id pata_buddha_zorro_tbl[] = {
> +       { ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, },
> +       { ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, },
> +       { ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, },

drivers/net/ethernet/8390/zorro8390.c also matches against
ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, while only
a single zorro_driver can bind to it.  Hence you can no longer use both
IDE and Ethernet on X-Surf :-(
Before, this worked, as the IDE driver just walked the list of devices.

I think the proper solution is to create MFD devices for Zorro boards
with multiple functions, and bind against the individual MFD cells.
That would also get rid of the nr_ports loop in the IDE driver, as each
instance would have its own cell.

I played with this a long time ago, but never finished it.
It worked fine for my Ariadne Ethernet card.
Last state at
https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git/log/?h=zorro-mfd

Oh, seems I wrote up most of this before in
https://lore.kernel.org/lkml/CAMuHMdVe1KgQWYZ_BfBkSo3zr0c+TenLMEw3T=BLEQNoZ6ex7A@mail.gmail.com/

> +       { 0 }
> +};

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds