linux-kernel - Re: [PATCH] extcon: usbc-tusb320: Call the Type-C IRQ handler only if a port is registered

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Date:   Mon, 7 Nov 2022 15:51:55 +0100
From:   Marek Vasut <marex@...x.de>
To:     Yassine Oudjana <yassine.oudjana@...il.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yassine Oudjana <y.oudjana@...tonmail.com>
Subject: Re: [PATCH] extcon: usbc-tusb320: Call the Type-C IRQ handler only if
 a port is registered

On 11/7/22 15:48, Yassine Oudjana wrote:
> From: Yassine Oudjana <y.oudjana@...tonmail.com>
> 
> Commit bf7571c00dca ("extcon: usbc-tusb320: Add USB TYPE-C support")
> added an optional Type-C interface to the driver but missed to check
> if it is in use when calling the IRQ handler. This causes an oops on
> devices currently using the old extcon interface. Check if a Type-C
> port is registered before calling the Type-C IRQ handler.
> 
> Fixes: bf7571c00dca ("extcon: usbc-tusb320: Add USB TYPE-C support")
> Signed-off-by: Yassine Oudjana <y.oudjana@...tonmail.com>
> ---
>   drivers/extcon/extcon-usbc-tusb320.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/extcon/extcon-usbc-tusb320.c b/drivers/extcon/extcon-usbc-tusb320.c
> index 41041ff0fadb..037bc11b2a48 100644
> --- a/drivers/extcon/extcon-usbc-tusb320.c
> +++ b/drivers/extcon/extcon-usbc-tusb320.c
> @@ -327,7 +327,14 @@ static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)
>   		return IRQ_NONE;
>   
>   	tusb320_extcon_irq_handler(priv, reg);
> -	tusb320_typec_irq_handler(priv, reg);
> +
> +	/*
> +	 * Type-C support is optional for backward compatibility.

It's the other way around, extcon is the legacy, type-c is the new, right ?

> +	 * Only call the Type-C handler if a port had been registered
> +	 * previously.
> +	 */
> +	if (priv->port)
> +		tusb320_typec_irq_handler(priv, reg);
>   
>   	regmap_write(priv->regmap, TUSB320_REG9, reg);

Reviewed-by: Marek Vasut <marex@...x.de>

Thanks!