From: Neil Armstrong <narmstrong@baylibre.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-mmc <linux-mmc@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [GIT PULL] MMC fixes for v5.13-rc8
Date: Mon, 28 Jun 2021 10:28:18 +0200 [thread overview]
Message-ID: <ae18ec4e-b91d-93a5-7f5f-f830646ed11a@baylibre.com> (raw)
In-Reply-To: <CAPDyKFrLSMpPJOgd5e4B1x3Vwfg4q23zgy4ESc8EmFL2MnyK7g@mail.gmail.com>
Hi,
On 28/06/2021 09:49, Ulf Hansson wrote:
> + Neil, Robin
>
> On Thu, 24 Jun 2021 at 20:00, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
>>
>> On Thu, Jun 24, 2021 at 5:32 AM Ulf Hansson <ulf.hansson@linaro.org> wrote:
>>>
>>> Neil Armstrong (1):
>>> mmc: meson-gx: use memcpy_to/fromio for dram-access-quirk
>>
>> Ugh. How horribly ugly.
>>
>> Why is that 'host->dram_access_quirk' test _inside_ the loop, rather
>> than be something like
>>
>> if (host->dram_access_quirk)
>> return sg_copy_to_buffer(data->sg, data->sg_len,
>> host->bounce_buf, xfer_bytes);
>>
>> at the top of the function, with meson_mmc_copy_buffer() then only
>> handling the mmio case?
>>
>> No, I don't know this code, I'm just looking at the patch and going
>> "that looks really ugly".
>>
>> Anyway, I've pulled it, but I thought I'd voice my reaction to it..
>
> Thanks, good point!
>
> Robin and Neil did discuss some cleanup that could be made on top [1],
> but it looks like that was targeting a different part.
Yes this was a quick hack (and obviously not the optimal way to) to address the fatal system crash.
>
> In any case, Neil, would you mind sending a cleanup according to the
> comment from Linus?
Sure, as discussed with Robin, the plan is to introduce sg_copy_to_buffer_to/fromio
and remove this crappy hack, but this requires multiple subsystems involved.
>
> Kind regards
> Uffe
Thanks,
Neil
>
> [1]
> https://www.spinics.net/lists/arm-kernel/msg901045.html
>
next prev parent reply other threads:[~2021-06-28 8:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 12:32 [GIT PULL] MMC fixes for v5.13-rc8 Ulf Hansson
2021-06-24 18:00 ` Linus Torvalds
2021-06-28 7:49 ` Ulf Hansson
2021-06-28 8:28 ` Neil Armstrong [this message]
2021-06-24 18:01 ` pr-tracker-bot
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