linux-kernel - Re: [PATCH v2 2/2] mmc: sh_mmcif: Advance sg

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Date: Thu, 22 Feb 2024 10:20:22 +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
Subject: Re: [PATCH v2 2/2] mmc: sh_mmcif: Advance sg_miter before reading blocks

On Wed, Feb 21, 2024 at 10:23 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> The introduction of sg_miter was a bit sloppy as it didn't
> exactly mimic the semantics of the old code on multiblock reads
> and writes: these like you to:
>
> - Advance to the first sglist entry *before* starting to read
>   any blocks from the card.
>
> - Advance and check availability of the next entry *right after*
>   processing one block.
>
> Not checking if we have more sglist entries right after
> reading a block will lead to this not being checked until we
> return to the callback to read out more blocks, i.e. until the
> next interrupt arrives. Since the last block is the last one
> (no more data will arrive) there will not be a next interrupt,
> and we will be waiting forever resulting in a timeout for
> command 18 when reading multiple blocks.
>
> The same bug was fixed also in the writing of multiple blocks.
>
> 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>

Thanks, eMMC works again (tested on APE6EVM and KZM9-GT-Dual).
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

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