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Date:   Wed, 6 Apr 2022 21:16:09 +0000
From:   Prashant Malani <pmalani@chromium.org>
To:     Akihiko Odaki <akihiko.odaki@gmail.com>
Cc:     linux-kernel@vger.kernel.org, chrome-platform@lists.linux.dev,
        Benson Leung <bleung@chromium.org>,
        Guenter Roeck <groeck@chromium.org>
Subject: Re: [PATCH] platform/chrome: cros_ec_typec: Check for EC driver
Message-ID: <Yk4DGZfpYbK8dofL@chromium.org>
References: <20220404041101.6276-1-akihiko.odaki@gmail.com>
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In-Reply-To: <20220404041101.6276-1-akihiko.odaki@gmail.com>
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Hi Akihiko,

Thanks for the patch.

On Apr 04 13:11, Akihiko Odaki wrote:
> The EC driver may not be initialized when cros_typec_probe is called,
> particulary when CONFIG_CROS_EC_CHARDEV=m.
> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
> ---
>  drivers/platform/chrome/cros_ec_typec.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index 4bd2752c0823..7cb2e35c4ded 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -1084,6 +1084,9 @@ static int cros_typec_probe(struct platform_device *pdev)
>  	}
>  
>  	ec_dev = dev_get_drvdata(&typec->ec->ec->dev);
> +	if (!ec_dev)
> +		return -EPROBE_DEFER;
> +

Just a quick check: are you still seeing this issue with 5.18-rc1, which
contains a null check for the parent EC device [1] ?

Thanks,

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/platform/chrome?id=ffebd90532728086007038986900426544e3df4e