linux-kernel - Re: [RESEND PATCH 2/2] Input: cros_ec_keyb

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Message-ID: <20160810211621.GB21385@roeck-us.net>
Date:	Wed, 10 Aug 2016 14:16:21 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Brian Norris <briannorris@...omium.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Lee Jones <lee.jones@...aro.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Olof Johansson <olof@...om.net>,
	Brian Norris <computersforpeace@...il.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Enric Balletbo <enric.balletbo@...labora.co.uk>,
	Shawn Nematbakhsh <shawnn@...omium.org>,
	Gwendal Grignou <gwendal@...omium.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org,
	"# 9798ac6d32c1 mfd : cros_ec : Add cros_ec_cmd_xfer_status helper" 
	<stable@...r.kernel.org>
Subject: Re: [RESEND PATCH 2/2] Input: cros_ec_keyb - Fix usage of
 cros_ec_cmd_xfer()

On Wed, Aug 10, 2016 at 01:37:19PM -0700, Brian Norris wrote:
> cros_ec_cmd_xfer returns success status if the command transport
> completes successfully, but the execution result is incorrectly ignored.
> In many cases, the execution result is assumed to be successful, leading
> to ignored errors and operating on uninitialized data.
> 
> We've recently introduced the cros_ec_cmd_xfer_status() helper to avoid these
> problems. Let's use it.
> 
> [Regarding the 'Fixes' tag; there is significant refactoring since the driver's
> introduction, but the underlying logical error exists throughout I believe]
> 
> Fixes: 6af6dc2d2aa6 ("input: Add ChromeOS EC keyboard driver")
> Cc: <stable@...r.kernel.org> # 9798ac6d32c1 mfd: cros_ec: Add cros_ec_cmd_xfer_status() helper
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>
> Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

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

> ---
>  drivers/input/keyboard/cros_ec_keyb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
> index b01966dc7eb3..6e48616a3a88 100644
> --- a/drivers/input/keyboard/cros_ec_keyb.c
> +++ b/drivers/input/keyboard/cros_ec_keyb.c
> @@ -160,7 +160,7 @@ static int cros_ec_keyb_get_state(struct cros_ec_keyb *ckdev, uint8_t *kb_state)
>  	msg->insize = ckdev->cols;
>  	msg->outsize = 0;
>  
> -	ret = cros_ec_cmd_xfer(ckdev->ec, msg);
> +	ret = cros_ec_cmd_xfer_status(ckdev->ec, msg);
>  	if (ret < 0) {
>  		dev_err(ckdev->dev, "Error transferring EC message %d\n", ret);
>  		goto exit;
> -- 
> 2.8.0.rc3.226.g39d4020
>