linux-kernel - Re: [PATCH] usb: typec: tipd: Fix error handling in cd321x_read_data

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Message-ID: <aNFUs9CqtLq7ozOV@kuha.fi.intel.com>
Date: Mon, 22 Sep 2025 16:52:51 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Sven Peter <sven@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH] usb: typec: tipd: Fix error handling in
 cd321x_read_data_status

On Sat, Sep 20, 2025 at 12:28:03PM +0000, Sven Peter wrote:
> Right now cd321x_read_data_status always returns true even if it
> encounters any errors: tps6598x_read_data_status returns a boolean but
> we treated it as an errno and then we have a bunch of dev_errs in case
> tps6598x_block_read fails but just continue along and return true.
> Fix that to correctly report errors to the callee.
> 
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/linux-usb/aMvWJo3IkClmFoAA@stanley.mountain/
> Signed-off-by: Sven Peter <sven@...nel.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/tipd/core.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 2b1049c9a6f3c4300f4a25a97fe502c47e82a134..d0c86347251c5cc19a9b377550c00c27966f8329 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -577,30 +577,36 @@ static bool cd321x_read_data_status(struct tps6598x *tps)
>  	int ret;
>  
>  	ret = tps6598x_read_data_status(tps);
> -	if (ret < 0)
> +	if (!ret)
>  		return false;
>  
>  	if (tps->data_status & TPS_DATA_STATUS_DP_CONNECTION) {
>  		ret = tps6598x_block_read(tps, TPS_REG_DP_SID_STATUS,
>  				&cd321x->dp_sid_status, sizeof(cd321x->dp_sid_status));
> -		if (ret)
> +		if (ret) {
>  			dev_err(tps->dev, "Failed to read DP SID Status: %d\n",
>  				ret);
> +			return false;
> +		}
>  	}
>  
>  	if (tps->data_status & TPS_DATA_STATUS_TBT_CONNECTION) {
>  		ret = tps6598x_block_read(tps, TPS_REG_INTEL_VID_STATUS,
>  				&cd321x->intel_vid_status, sizeof(cd321x->intel_vid_status));
> -		if (ret)
> +		if (ret) {
>  			dev_err(tps->dev, "Failed to read Intel VID Status: %d\n", ret);
> +			return false;
> +		}
>  	}
>  
>  	if (tps->data_status & CD321X_DATA_STATUS_USB4_CONNECTION) {
>  		ret = tps6598x_block_read(tps, TPS_REG_USB4_STATUS,
>  				&cd321x->usb4_status, sizeof(cd321x->usb4_status));
> -		if (ret)
> +		if (ret) {
>  			dev_err(tps->dev,
>  				"Failed to read USB4 Status: %d\n", ret);
> +			return false;
> +		}
>  	}
>  
>  	return true;
> 
> ---
> base-commit: a4e143636d5def935dd461539b67b61287a8dfef
> change-id: 20250920-tipd-fix-0c50f9f99a5a
> 
> Best regards,
> -- 
> Sven Peter <sven@...nel.org>
> 

-- 
heikki