linux-kernel - Re: [PATCH] usb: typec: mux: Fix copy-paste of the container

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Date:   Mon, 17 May 2021 12:09:30 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: typec: mux: Fix copy-paste of the container_of

Hi,

On Sat, May 15, 2021 at 08:48:33PM -0700, Bjorn Andersson wrote:
> Some of the boilerplate code was copy pasted from the typec_switch and
> retained the use of the switch's container_of macros. The two structs
> are identical in this regard, so this change doesn't cause a functional
> change today, but could possibly cause future issues.
> 
> Fixes: 3370db35193b ("usb: typec: Registering real device entries for the muxes")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/usb/typec/mux.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
> index 8514bec7e1b8..e4467c4c3742 100644
> --- a/drivers/usb/typec/mux.c
> +++ b/drivers/usb/typec/mux.c
> @@ -45,7 +45,7 @@ static void *typec_switch_match(struct fwnode_handle *fwnode, const char *id,
>  	dev = class_find_device(&typec_mux_class, NULL, fwnode,
>  				switch_fwnode_match);
>  
> -	return dev ? to_typec_switch(dev) : ERR_PTR(-EPROBE_DEFER);
> +	return dev ? to_typec_mux(dev) : ERR_PTR(-EPROBE_DEFER);

That does not look correct to me?

>  }
>  
>  /**
> @@ -87,7 +87,7 @@ EXPORT_SYMBOL_GPL(typec_switch_put);
>  
>  static void typec_switch_release(struct device *dev)
>  {
> -	kfree(to_typec_switch(dev));
> +	kfree(to_typec_mux(dev));

Ditto.

>  }
>  
>  static const struct device_type typec_switch_dev_type = {
> @@ -239,7 +239,7 @@ static void *typec_mux_match(struct fwnode_handle *fwnode, const char *id,
>  	dev = class_find_device(&typec_mux_class, NULL, fwnode,
>  				mux_fwnode_match);
>  
> -	return dev ? to_typec_switch(dev) : ERR_PTR(-EPROBE_DEFER);
> +	return dev ? to_typec_mux(dev) : ERR_PTR(-EPROBE_DEFER);

That looks correct.

Either I'm missing something, or only the last change is needed.

thanks,

-- 
heikki