linux-kernel - Re: [PATCH] tps6598x: clear int mask on probe failure

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Message-ID: <Yg4HwO2SKGDvOASz@kuha.fi.intel.com>
Date:   Thu, 17 Feb 2022 10:30:56 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Sven Peter <sven@...npeter.dev>
Subject: Re: [PATCH] tps6598x: clear int mask on probe failure

On Tue, Feb 15, 2022 at 11:22:04AM -0700, Jens Axboe wrote:
> The interrupt mask is enabled before any potential failure points in
> the driver, which can leave a failure path where we exit with
> interrupts enabled but the device not live. This causes an infinite
> stream of interrupts on an Apple M1 Pro laptop on USB-C.
> 
> Add a failure label that's used post enabling interrupts, where we
> mask them again before returning an error.
> 
> Suggested-by: Sven Peter <sven@...npeter.dev>
> Signed-off-by: Jens Axboe <axboe@...nel.dk>

Should this be marked as a fix?

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

> ---
>  drivers/usb/typec/tipd/core.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 6d27a5b5e3ca..7ffcda94d323 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -761,12 +761,12 @@ static int tps6598x_probe(struct i2c_client *client)
>  
>  	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
>  	if (ret < 0)
> -		return ret;
> +		goto err_clear_mask;
>  	trace_tps6598x_status(status);
>  
>  	ret = tps6598x_read32(tps, TPS_REG_SYSTEM_CONF, &conf);
>  	if (ret < 0)
> -		return ret;
> +		goto err_clear_mask;
>  
>  	/*
>  	 * This fwnode has a "compatible" property, but is never populated as a
> @@ -855,7 +855,8 @@ static int tps6598x_probe(struct i2c_client *client)
>  	usb_role_switch_put(tps->role_sw);
>  err_fwnode_put:
>  	fwnode_handle_put(fwnode);
> -
> +err_clear_mask:
> +	tps6598x_write64(tps, TPS_REG_INT_MASK1, 0);
>  	return ret;
>  }

-- 
heikki