linux-kernel - Re: [PATCH] platform/chrome: cros_ec_lpc: Fix error code in cros_ec_lpc_mec_read

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Date: Thu, 13 Jun 2024 07:02:46 -0700
From: Guenter Roeck <groeck@...gle.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Ben Walsh <ben@...nut.com>, Benson Leung <bleung@...omium.org>, 
	Tzung-Bi Shih <tzungbi@...nel.org>, Guenter Roeck <groeck@...omium.org>, 
	chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] platform/chrome: cros_ec_lpc: Fix error code in cros_ec_lpc_mec_read_bytes()

On Thu, Jun 13, 2024 at 6:55 AM Dan Carpenter <dan.carpenter@...aro.org> wrote:
>
> We changed these functions to returning negative error codes, but this
> first error path was accidentally overlooked.  It leads to a Smatch
> warning:
>
>     drivers/platform/chrome/cros_ec_lpc.c:181 ec_response_timed_out()
>     error: uninitialized symbol 'data'.
>
> Fix this by returning the error code instead of success.
>
> Fixes: 68dbac0a58ef ("platform/chrome: cros_ec_lpc: MEC access can return error code")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>  drivers/platform/chrome/cros_ec_lpc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
> index ebe9fb143840..f0470248b109 100644
> --- a/drivers/platform/chrome/cros_ec_lpc.c
> +++ b/drivers/platform/chrome/cros_ec_lpc.c
> @@ -139,7 +139,7 @@ static int cros_ec_lpc_mec_read_bytes(unsigned int offset, unsigned int length,
>         int in_range = cros_ec_lpc_mec_in_range(offset, length);
>
>         if (in_range < 0)
> -               return 0;
> +               return in_range;
>
>         return in_range ?
>                 cros_ec_lpc_io_bytes_mec(MEC_IO_READ,
> @@ -158,7 +158,7 @@ static int cros_ec_lpc_mec_write_bytes(unsigned int offset, unsigned int length,
>         int in_range = cros_ec_lpc_mec_in_range(offset, length);
>
>         if (in_range < 0)
> -               return 0;
> +               return in_range;
>
>         return in_range ?
>                 cros_ec_lpc_io_bytes_mec(MEC_IO_WRITE,
> --
> 2.43.0
>