linux-kernel - Re: [PATCH] platform/chrome: cros_ec

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Date:   Mon, 14 Nov 2022 02:30:15 +0000
From:   patchwork-bot+chrome-platform@...nel.org
To:     Brian Norris <briannorris@...omium.org>
Cc:     bleung@...omium.org, groeck@...omium.org, tzungbi@...nel.org,
        dmitry.torokhov@...il.com, swboyd@...omium.org,
        chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/chrome: cros_ec_lpc: Force synchronous probe

Hello:

This patch was applied to chrome-platform/linux.git (for-kernelci)
by Tzung-Bi Shih <tzungbi@...nel.org>:

On Fri, 11 Nov 2022 15:13:01 -0800 you wrote:
> This reverts commit bd88b965ae8c ("platform/chrome: cros_ec_lpc: Mark
> PROBE_PREFER_ASYNCHRONOUS"), and then some.
> 
> It has been reported that there are issues with 'cros-ec-keyb' devices
> that are children of this. As noted in the initial patch for its ACPI
> support (commit ba0f32141bc5 ("Input: cros_ec_keyb - handle x86
> detachable/convertible Chromebooks")), it's possible to probe an ACPI
> child device before its parent is probed -- hence the need for
> EPROBE_DEFER. Unfortunately, poking your parent's dev_get_drvdata()
> isn't safe with asynchronous probe, as there's no locking, and the
> ordering is all wrong anyway (drvdata is set before the device is
> *really* ready).
> 
> [...]

Here is the summary with links:
  - platform/chrome: cros_ec_lpc: Force synchronous probe
    https://git.kernel.org/chrome-platform/c/ca821c1f4ec1

You are awesome, thank you!
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