Re: [PATCH v2 1/2] m68k/mac: Replace macide driver with generic platform drivers

[Geert Uytterhoeven]

On Tue, Jun 8, 2021 at 8:04 AM Finn Thain <fthain@xxxxxxxxxxxxxx> wrote:
> This allows m68k mac systems to switch from the deprecated IDE subsystem
> to libata.
>
> This was tested on my Quadra 630. I haven't tested it on my PowerBook 150
> because I don't have a RAM adapter board for it. It appears that the
> hardware I tested doesn't need macide_clear_irq() or macide_test_irq().
> If it did, the generic driver would not have worked. It's possible that
> those routines are needed for the PowerBook 150 but we can cross that
> bridge if and when we come to it.
>
> BTW, macide_clear_irq() appears to suffer from a race condition. The write
> to the interrupt flags register could have unintended side effects as it
> may alter other flag bits. Fortunately, all of the other bits are unused
> by Linux. When tested on my Quadra 630, the assignment *ide_ifr &= ~0x20
> was observed to have no effect on bit 5, so it may be redundant anyway.
>
> Cc: Michael Schmitz <schmitzmic@xxxxxxxxx>
> Cc: Joshua Thompson <funaho@xxxxxxxxx>
> Reviewed-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
> Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxx>

Thanks for your patch!

>  arch/m68k/configs/mac_defconfig   |   1 -
>  arch/m68k/configs/multi_defconfig |   1 -
>  arch/m68k/mac/config.c            |  24 +++--
>  drivers/ide/Kconfig               |  14 ---
>  drivers/ide/Makefile              |   1 -
>  drivers/ide/macide.c              | 161 ------------------------------
>  6 files changed, 14 insertions(+), 188 deletions(-)
>  delete mode 100644 drivers/ide/macide.c

Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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