linux-kernel - Re: [PATCH 2/2] usb: typec: tcpm: Error handling for tcpm_register_partner

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Message-ID: <de0ea27c-0e73-6e8e-b7b5-fda4a0f4f545@roeck-us.net>
Date:   Mon, 13 Jul 2020 23:49:06 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Kyle Tso <kyletso@...gle.com>, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org
Cc:     badhri@...gle.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] usb: typec: tcpm: Error handling for
 tcpm_register_partner_altmodes

On 7/13/20 8:34 PM, Kyle Tso wrote:
> typec_partner_register_altmode returns ERR_PTR. Reset the pointer
> altmode to NULL on failure.
> 
> Signed-off-by: Kyle Tso <kyletso@...gle.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/usb/typec/tcpm/tcpm.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 82b19ebd7838..a6d4b03ec250 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -1061,9 +1061,11 @@ static void tcpm_register_partner_altmodes(struct tcpm_port *port)
>  	for (i = 0; i < modep->altmodes; i++) {
>  		altmode = typec_partner_register_altmode(port->partner,
>  						&modep->altmode_desc[i]);
> -		if (!altmode)
> +		if (IS_ERR(altmode)) {
>  			tcpm_log(port, "Failed to register partner SVID 0x%04x",
>  				 modep->altmode_desc[i].svid);
> +			altmode = NULL;
> +		}
>  		port->partner_altmode[i] = altmode;
>  	}
>  }
>