linux-kernel - Re: [PATCH v2] extcon: fix extcon_get_extcon

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Message-ID: <20211216075233.GD1978@kadam>
Date:   Thu, 16 Dec 2021 10:52:33 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Sebastian Reichel <sre@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] extcon: fix extcon_get_extcon_dev() error handling

On Thu, Dec 16, 2021 at 03:39:46PM +0900, Chanwoo Choi wrote:
> Hi Dan,
> 
> First of all,  sorry for late reply.
> 
> There is one issue. About this issue, I already discussed on patch[1]
> [1] https://lore.kernel.org/lkml/5BEB63C3.1020504@samsung.com/ 
> 
> extcon_get_extcon_dev() is used for anywhere except for probe step.
> But EPROBE_DEFER is only used on probe step.
> 
> So that it is not clear to return EPROBE_DEFER from extcon_get_extcon_dev()
> because extcon_get_extcon_dev() never know either call it on probe function
> or not.

Currently extcon_get_extcon_dev() is only called from probe so it's not
an issue.

It's impossible to know what future programmers will want, but I feel
like this change probably makes it easier for them.

regards,
dan carpenter