linux-kernel - Re: [PATCH] mmc: sh_mmcif: sg_miter does not need to be atomic

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Message-ID: <CAMuHMdXdatXk4H2M0tr3fiZMGzx9FbuNUvCbhRbT0W2wfMVKdA@mail.gmail.com>
Date: Wed, 21 Feb 2024 10:43:12 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH] mmc: sh_mmcif: sg_miter does not need to be atomic

Hi Linus,

Thanks for your patch!

s/does not need to/must/?

On Tue, Feb 20, 2024 at 11:58 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> All the sglist iterations happen in the *threaded* interrupt handler
> and that context is not atomic, so don't request an atomic
> sglist miter. Using an atomic miter results in "BUG: scheduling while
> atomic" splats.
>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Fixes: 27b57277d9ba ("mmc: sh_mmcif: Use sg_miter for PIO")
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
> Hi Geert, it'd be great if you could test this!

Thanks, that fixes the BUG, so
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

Unfortunately it is not sufficient to make the eMMC work fully.
I will follow up in the original thread...

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

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